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{{Short description|1970 science fiction novel by Larry Niven}}
{{Use mdy dates|date=March 2025}}
{{Infobox book <!-- See [[Wikipedia:WikiProject Novels]]. Information about first edition is preferred. -->
| name          = Ringworld
| title_orig    = 
| translator    = 
| image         = Ringworld(1stEd).jpg
| caption       = Paperback first edition
| author        = [[Larry Niven]]
| illustrator   = Dean Ellis
| cover_artist  = 
| country       = United States
| language      = English
| series        = [[Ringworld series|Ringworld]] storyline from [[Known Space]]
| genre         = [[Science fiction]]
| publisher     = [[Ballantine Books]]
| release_date  = October 1970
| english_release_date=
| media_type    = Print ([[hardcover]], [[paperback]]), [[audiobook]]
| pages         = 342 pages
| awards        = [[Locus Award for Best Novel]] (1971)
| isbn          = 0-345-02046-4
| oclc          = 
| preceded_by   = 
| followed_by   = [[The Ringworld Engineers]], 1979
}}

'''''Ringworld''''' is a 1970 [[science fiction]] novel by [[Larry Niven]], set in his [[Known Space]] universe and considered a classic of science fiction literature. ''Ringworld'' tells the story of Louis Wu and his companions on a mission to the Ringworld, an enormous rotating ring, an alien construct in space {{Convert|186|e6mi||abbr=off}} in diameter. Niven later wrote three sequel novels and then cowrote, with [[Edward M. Lerner]], four prequels and a final sequel; the five latter novels constitute the ''[[Fleet of Worlds]]'' series. All the novels in the [[Ringworld series|''Ringworld'' series]] tie into numerous other books set in Known Space. ''Ringworld'' won the [[Nebula Award for Best Novel|Nebula Award]] in 1970,<ref name="WWE-1970">{{cite web|url= http://www.worldswithoutend.com/books_year_index.asp?year=1970|title=1970 Award Winners & Nominees|work=Worlds Without End|access-date=2009-07-20}}</ref> as well as both the [[Hugo Award for Best Novel|Hugo Award]] and [[Locus Award for Best Novel|Locus Award]] in 1971.<ref name="WWE-1971">{{cite web|url=http://www.worldswithoutend.com/books_year_index.asp?year=1971|title=1971 Award Winners & Nominees|work=Worlds Without End|access-date=2009-07-20}}</ref>

==Plot summary==
On [[Earth]] in 2850 AD, a bored [[Louis Wu]] is celebrating his 200th birthday. Despite his age, Louis is in perfect physical condition due to the [[Longevity|longevity drug]] [[Known Space#Boosterspice|boosterspice]]. [[Nessus (Pierson's Puppeteer)|Nessus]], a [[Pierson's Puppeteers|Pierson's puppeteer]], offers him a mysterious job. Intrigued, Louis accepts. Nessus also recruits the [[Kzin]] [[Speaker-to-Animals]] and [[Teela Brown]], a young human woman who becomes Louis's lover, for the rest of the ship's crew.

On the puppeteer home world (which is fleeing deadly radiation that will arrive in 20,000 years), they are told that their goal is to determine if the Ringworld, a gigantic artificial ring near the puppeteers' path, poses any threat to their migration. The Ringworld is about one million miles (1.6 million km) wide and approximately the diameter of Earth's orbit, encircling a sunlike star. It rotates to provide artificial gravity 99% as strong as Earth's from [[centrifugal force]]. It has a habitable inner surface (equivalent in area to approximately three million Earths), a breathable atmosphere, and a temperature optimal for humans. Night is provided by an inner ring of shadow squares which are connected to each other by thin, ultra-strong wire. When the crew completes their mission, as payment they will be given the starship they used to travel to the puppeteer world; it is about 1000 times faster than any human or Kzinti ship.

When they reach the vicinity of the Ringworld, they are unable to contact anyone. Their ship, the ''Lying Bastard'', is disabled by an automated [[meteoroid]]-defense system. The vessel collides with a strand of shadow-square wire and crash-lands near a huge mountain, which is called "Fist-of-God" by the first natives they speak with. The fusion drive is destroyed, so they set out to find a way to get the ''Lying Bastard'' off the Ringworld and use the undamaged hyperdrive to return home.

Using their flycycles, they set out for the rim of the ring, searching for technology to help them get home. They encounter primitive human natives who live in the ruins of a once-advanced city. The natives think that Louis is one of the engineers who created the ring, whom they revere as gods. The crew is attacked when Louis accidentally commits what the natives consider a blasphemy, but extricate themselves.

During their journey, Nessus reveals several puppeteer secrets. They initiated research into rendering the Kzinti extinct, considering them dangerous and useless, but found that the numerous [[Man-Kzin]] wars&mdash;which the Kzinti always lost&mdash;had greatly reduced their aggression: a very high percentage of Kzinti males were killed in each conflict, leaving more prudent and cautious survivors to breed. The puppeteers had also used Birthright Lotteries to try to breed humans for luck: all of Teela's ancestors for six generations are lottery winners. Speaker's outrage at learning the former forces Nessus to flee from the group and then follow from a safe distance.

While flying through a giant storm, Teela becomes separated from the others. When Louis and Speaker search for her, their flycycles are caught by an automated trap designed to catch speeders. They are brought to a floating police station. There, they meet Halrloprillalar Hotrufan ("Prill"), a former crew member of a ship that had brought back goods from worlds abandoned by the Ringworld builders. Nessus, using a tasp (a remote pleasure-giving device), conditions Prill into helping and joining them. When her ship returned to the Ringworld the last time, they discovered that civilization had collapsed. Louis surmises that a mold inadvertently brought back by a ship like Prill's mutated and broke down the superconductors vital to the Ringworld civilization, causing its fall.

Teela rejoins them, accompanied by her new lover, a traveling warrior named Seeker who protected her. Based on an insight gained from studying a Ringworld map, Louis comes up with a plan to get home. Teela chooses to remain on the Ringworld with Seeker. Louis, formerly skeptical about breeding for luck, now wonders if the entire mission was caused by Teela's luck, to unite her with her true love and help her mature.

The party collects one end of the shadow-square wire that snapped after the collision with their ship and fell near their path, and drag it behind them. Louis threads it through the ''Lying Bastard'' to tether it to the floating police station. "Fist-of-God", the enormous mountain near their crash site, was not on the Ringworld map, leading Louis to guess that it is the result of a meteoroid striking the underside of the ring, pushing the ring's floor up and finally breaking through. The top of the mountain, above the atmosphere, is therefore just a hole. Louis uses the police station to drag the ''Lying Bastard'' up and into the hole. Once the ship falls through and clears the ring, they can use its hyperdrive to get home. The book concludes with Louis and Speaker discussing returning to the Ringworld.

==Reception== 
''Ringworld'' was met with immediate critical acclaim and received the "triple crown" of science fiction awards. It won the [[Nebula Award]] for [[Nebula Award for Best Novel|Best Novel]] in 1970,<ref>{{cite web|url=https://nebulas.sfwa.org/award-year/1970/|title=1970 Nebula Awards|publisher=[[Science Fiction and Fantasy Writers of America]]|access-date=2025-11-03}}</ref> the [[Hugo Award for Best Novel]] in 1971,<ref>{{cite web|url=https://www.thehugoawards.org/hugo-history/1971-hugo-awards/|title=1971 Hugo Awards|publisher=World Science Fiction Society|access-date=2025-11-03}}</ref> and the [[Locus Award for Best Novel]] in 1971.<ref>{{cite web|url=https://www.sfadb.com/Locus_Awards_1971|title=Locus Awards 1971|website=Science Fiction Awards Database|access-date=2025-11-03}}</ref>

Reviewers lauded the novel's grand scale and inventiveness. [[Algis Budrys]] found ''Ringworld'' to be "excellent and entertaining ... woven together very skillfully and proceed[ing] at a pretty smooth pace.,<ref>""Galaxy Bookshelf", ''[[Galaxy Science Fiction|Galaxy]]'', March 1971, pp. 112–13. In ''[[Locus (magazine)|Locus]]''</ref> Charles N. Brown called it "a first rate adventure story" and remarked that the central megastructure was "so gigantic that it is hard to visualize."<ref>{{Cite journal |last=Brown |first=Charles N. |date=1970-11-26 |title=Review of Ringworld |journal=Locus |issue=68}}</ref> The book is frequently identified as a definitive example of the "[[Big Dumb Object]]" concept in science fiction.

''Ringworld'' is recognized for its enduring influence. Writing for ''[[The Guardian]]'' in 2010, Sam Jordison described it as "arguably one of the most influential science fiction novels of the past 50 years.<ref>"{{Cite web |date=2010-07-02 |title=Back to the Hugos: Ringworld by Larry Niven |last=Jordison |first=Sam |url=https://www.theguardian.com/books/booksblog/2010/jul/02/larry-niven-ringworld |access-date=2025-11-03 |website=The Guardian |language=en}}</ref> The concept of a habitable, ring-shaped megastructure has been cited as an inspiration for other works, most notably the ''[[Halo (franchise)|Halo]]'' video game series, which features similar structures known as Halo Rings.<ref>{{Cite web|url=https://www.ign.com/articles/2007/08/10/halo-story-so-far|title=The Halo Story, So Far|last=Perry|first=Douglass C.|date=2007-08-10|website=IGN|access-date=2025-11-03|quote=Inspired by Larry Niven's excellent 1970 sci-fi novel Ringworld, the first Halo introduced a massive, mysterious ring-shaped world.}}</ref>

==Concepts reused==
In addition to the two aliens, Niven includes a number of concepts from his other Known Space stories:
* The puppeteers' [[General Products (Larry Niven)|General Products hulls]], which are impervious to any known force except [[visible light]] and [[gravity]], and for a long time thought indestructible by anything except [[antimatter]]. The ''Fleet of Worlds'' prequels reveal two other ways that the hulls can be destroyed. 
* The [[Slaver stasis field]], which causes time in the enclosed volume to stand still; since time has for all intents and purposes ceased for an object in [[Stasis (fiction)|stasis]], no harm can come to anything within the field.
* The idea that [[luck]] is a [[genetics|genetic]] trait that can be strengthened by [[selective breeding]].
* The tasp, a device that remotely stimulates the [[pleasure center]] of the [[brain]]; it temporarily incapacitates its target and is extremely psychologically addictive. If the subject cannot, for whatever reason, get access to the device, intense depression can result, often to the point of madness or suicide. To use a tasp on someone from hiding, relieving them of their anger or depression, is called "making their day".
* [[Boosterspice]], a drug that restores or indefinitely preserves youth.
* Scrith, the metal-like substance of which the ''Ringworld'' is built (and presumably the shadow squares and wires too), that has a [[tensile strength]] nearly equal in magnitude to the [[Strong interaction|strong nuclear force]] making it similar to the concept of [[nuclear matter]]. This makes it an example of [[Unobtainium#Science fiction|unobtainium]]. This is similar to the Pak Protector's "twing" used in other Larry Niven stories.
* Impact armor, a flexible form of clothing that [[Non-Newtonian fluid|hardens instantly into a rigid form]] stronger than steel when rapidly deformed, similar to [[Ballistic vest#Nanomaterials in ballistics|certain types of bulletproof vests]].
* The hyperspace shunt, an engine for faster-than-light travel, but slow enough (1&nbsp;[[light-year]] per 3&nbsp;days, ~122&nbsp;[[Proper velocity|''c'']]) to keep the galaxy vast and unknown; the new "quantum&nbsp;II hyperspace shunt", developed by the Puppeteers but not yet released to humans, can cross a light-year in just 1.25&nbsp;minutes (~421&nbsp;000&nbsp;[[Proper velocity|''c'']]).
* Point-to-point teleportation at the speed of light is possible with [[transfer booth]]s (on Earth) and [[stepping disk]]s (on the Puppeteer homeworld); on Earth, people's sense of place and global position has been lost due to instantaneous travel; cities and cultures have blended together.
* A theme well covered in the novel is that of cultures suffering technological breakdowns who then proceed to revert to belief systems along [[religion|religious]] lines. Most ''Ringworld'' societies have forgotten that they live on an artificial structure, and now attribute the phenomena and origin of their world to divine power.

==Errors==
[[File:Ringworld render.png|thumb|right|Artist's rendition]]
The opening chapter of the original paperback edition of ''Ringworld'' featured Louis Wu teleporting eastward around the Earth in order to extend his birthday. Moving in this direction would, in fact, make local time later rather than earlier, so that Wu would soon arrive in the early morning of the next calendar day. Niven was "endlessly teased" about this error, which he corrected in subsequent printings to show Wu teleporting westward.<ref>{{cite web|title=Fantastic Reviews: Larry Niven Interview|url= http://www.geocities.com/fantasticreviews/niven_interview.htm|date=August 2004|access-date=2009-05-10|archive-url=https://web.archive.org/web/20091026143700/http://geocities.com/fantasticreviews/niven_interview.htm|url-status=dead|archive-date=2009-10-26}}</ref> In his dedication to ''The Ringworld Engineers'', Niven wrote, "If you own a first paperback edition of ''Ringworld'', it's the one with the mistakes in it. It's worth money."<ref>{{cite book|title=The Ringworld Engineers|last=Niven|first=Larry|year=1980|publisher=Ballantine Books (Del Rey)|location=New York|isbn=0-345-33430-2|page=vii }}</ref>

After the publication of ''Ringworld'', many fans identified numerous engineering problems in the Ringworld as described in the novel. One major one was that the Ringworld, being a rigid structure, was not actually in orbit around the star it encircled and would eventually drift, ultimately colliding with its sun and disintegrating. This led [[Massachusetts Institute of Technology|MIT]] students attending the 1971 [[World Science Fiction Convention|Worldcon]] to chant, "The Ringworld is unstable!" Niven wrote the 1980 sequel ''[[The Ringworld Engineers]]'' in part to address these engineering issues.

The second chapter refers to standard Earth gravity as {{val|9.98|u=m/s2}} (or even gives the unit as m/s [''sic'']), while [[Standard gravity|standard Earth gravity]] is {{val|9.81|u=m/s2}}. 
The fifth chapter refers to Nereid as Neptune's largest moon; the planet's largest moon is Triton.

[[File:Ringworld .jpg|thumb|right|Ringworld]]

==Influence==
"Ringworld" has become a generic term for such a structure, which is an example of what science fiction fans call a "[[Big Dumb Object]]", or more formally a [[megastructure]]. Other science fiction authors have devised their own variants of Niven's Ringworld, notably [[Iain M. Banks]]' [[Orbital (The Culture)|Culture Orbital]]s, best described as miniature Ringworlds, and the titular ring-shaped [[Halo (megastructure)|Halo]] structures of the video game series ''[[Halo (video game series)|Halo]]''. Such a mini-Ringworld appears in ''Star Wars: [[The Book of Boba Fett]]'', season 1, episode 5.{{citation needed|date=February 2023}}.  In the Paramount+ series [[Star Trek: Lower Decks]] season 4, episode 3, "In the Cradle of Vexilon", a Ringworld-like world is prominently featured.

==Adaptations==

===Games===
In 1984, a [[role-playing game]] based on this setting was produced by [[Chaosium]] named ''[[Ringworld (role-playing game)|The Ringworld Roleplaying Game]]''. Information from the RPG, along with notes composed by RPG author John Hewitt with Niven, was later used to form the "Bible" given to authors writing in the ''[[Man-Kzin Wars]]'' series. Niven himself recommended that Hewitt write one of the stories for the original two MKW books, although this never came to pass.<ref>''[[Scatterbrain (Niven)|Scatterbrain]]'', pp. 293-301</ref>

[[Tsunami Games]] released two [[adventure game]]s based on ''Ringworld''. ''[[Ringworld: Revenge of the Patriarch]]'' was released in 1992 and ''Return to Ringworld'' in 1994. A third game, ''Ringworld: Within ARM's Reach'', was also planned, but never completed.

The video game franchise ''[[Halo (franchise)|Halo]]'', created by [[Bungie]], took inspiration from the book in the creation and development of its story around the eponymous rings, called Halos. These are physically similar to the Ringworld, however they are much smaller and do not encircle the star, instead orbiting stars or planets.

The open source video game ''[[Endless Sky]]'' features an alien species that creates ringworlds.

In 2017, Paradox Interactive added a [[DLC (video gaming)|DLC]] called "Utopia" to their game [[Stellaris (video game)|''Stellaris'']],<ref>{{Cite web|url=https://store.steampowered.com/app/281990/Stellaris/|title=Stellaris on Steam|website=store.steampowered.com|language=en|access-date=2019-02-15}}</ref> allowing the player to restore or build ringworlds.

In 2021, Mobius Digital added a [[DLC (video gaming)|DLC]] called [[Outer Wilds#Echoes of the Eye|"Echoes of the Eye"]] to their game ''[[Outer Wilds]]'',<ref>{{Cite web|url=https://store.steampowered.com/app/753640/Outer_Wilds/|title=Outer Wilds on Steam|website=store.steampowered.com|language=en|access-date=2021-01-06}}</ref>{{primary source inline|date=March 2022}} which allows the player to explore a hidden, abandoned ringworld and determine what happened to its inhabitants.<!--

--><!-- Notability not established: The [[massively multiplayer online game]] ''Shores of Hazeron'' by Software Engineering Inc. features abandoned ringworld structures for players to discover and colonize. Ringworlds in ''[[Shores of Hazeron]]'' are the creations of ancient precursor species not featured in the game. In addition to acting as centres for habitation, these rings feature functionalities such as self-sustaining power generation, the creation of interstellar wormholes, and simulated day-night cycles via orbital solar shields. -->

===On screen===
There have been many aborted attempts to adapt the novel to the screen.

In 2001, Larry Niven reported that a movie deal had been signed and was in the early planning stages.<ref>{{cite web |url=http://www.space.com/sciencefiction/movies/ringworld_movie_001106.html |title=Ringworld Movie Around the Corner |publisher=Space.com |date=2000-11-06 |access-date=2010-06-28 |url-status=dead |archive-url=https://web.archive.org/web/20100831133325/http://www.space.com/sciencefiction/movies/ringworld_movie_001106.html |archive-date=2010-08-31 }}</ref><ref>{{cite web| url = http://www.larryniven.org/ringworld_movie_news.shtml| title = Ringworld Movie News| work = Known Space: The Future Worlds of Larry Niven| access-date = 2008-08-10| archive-date = 2009-09-21| archive-url = https://web.archive.org/web/20090921170940/http://www.larryniven.org/ringworld_movie_news.shtml| url-status = dead}}</ref>

In 2004, the [[SyFy|Sci-Fi Channel]] reported that it was developing a ''Ringworld'' miniseries.<ref>{{cite web |url=http://www.cinescape.com/0/editorial.asp?aff_id=0&this_cat=Television&action=page&type_id=&cat_id=270355&obj_id=41212 |title=Sci Fi Channel goes supernova with new shows, series and specials |archive-url=https://web.archive.org/web/20061006170420/http://www.cinescape.com/0/editorial.asp?aff_id=0&this_cat=Television&action=page&type_id=&cat_id=270355&obj_id=41212 |archive-date=2006-10-06 |author=Patrick Sauriol |date=6 April 2004 |work=The Sci Fi Channel}}</ref> The series never came to fruition.

In 2013, it was again announced by the channel, now rebranded as [[Syfy]], that a miniseries of the novel was in development. This proposed four-hour miniseries was being written by [[Michael R. Perry]] and would have been a co-production between [[MGM Television]] and [[Universal Cable Productions]].<ref>{{cite web|url=http://insidetv.ew.com/2013/04/10/ringworld-syfy/|title='Ringworld' miniseries in the works at Syfy  |publisher=ew.com |date=2013-04-10 |access-date=2013-04-11}}</ref>

In 2017, [[Amazon Studios|Amazon]] announced that ''Ringworld'' was one of three science fiction series it was developing for [[Amazon Prime Video|its streaming service]]. MGM were again listed as a co-producer.<ref>{{cite magazine|url=https://variety.com/2017/tv/news/amazon-studios-lazarus-snow-crash-ringworld-1202576048/|title=Amazon Increases Production Spending for 2018, Developing 3 New Sci-Fi Series|magazine=Variety|date=2017-09-28|last=Birnbaum|first=Debra}}</ref>

===OEL manga===
Tor/Seven Seas (same joint venture of [[Macmillan Publishers|Macmillan]]'s [[Tor Books]] and [[Seven Seas Entertainment]] who also published the English-language translation of ''[[Afro Samurai]]'') published a two-part [[original English-language manga]] adaptation of ''Ringworld'', with the script written by [[Robert Mandell (film producer)|Robert Mandell]] and the artwork by [[Sean Lam]].<ref>{{Cite web|title=Ringworld: The Graphic Novel, part one|url=https://us.macmillan.com/books/9780765324627}}</ref> ''Ringworld: The Graphic Novel, Part One'', covering the events of the novel up to the sunflower attack on Speaker, was released on July 8, 2014. ''Part Two'' was released on November 10, 2015.

==In other works==
<!-- Not an example, there is no star involved: * In the ''[[Dungeons & Dragons]]'' setting [[Planescape]], the city [[Sigil (Dungeons & Dragons)|Sigil]] sits atop a gigantic spire that the Outlands rotates around, which is portrayed as a Niven Ringworld that all the other planes have representative cities upon. -->
* [[Terry Pratchett]] intended his 1981 novel ''[[Strata (novel)|Strata]]'' to be a "piss-take/homage/satire" of ''Ringworld''. Niven took it in good humor and enjoyed the work.<ref>{{cite web|url=http://www.lspace.org/books/apf/strata.html|title=The Annotated Pratchett File v9.0 - Strata|publisher=Lspace.org|access-date= 2010-06-28}}</ref>
* The plot of the [[first-person shooter]] game series [[Halo (franchise)|''Halo'']] involves artificial ring structures known as the Halo Array. Similarities to ''Ringworld'' have been noted,<ref name="literary">{{cite web|url=http://xbox.ign.com/articles/709/709122p5.html|title=The Influence of Literature and Myth in Videogames|website=IGN|first=Douglass C.|last=Perry|date=2007-03-17|access-date=2007-12-10|url-status=dead|archive-url=https://web.archive.org/web/20090220080109/http://xbox.ign.com/articles/709/709122p5.html|archive-date=2009-02-20}}</ref> and Niven was asked (but declined) to write the [[Halo: The Fall of Reach|first novel]] based on the series.<ref>{{cite web|url=http://bs.bungie.org/2003/03/the_halo_author_1.html#000320|title=The Halo Author that Wasn't|publisher=[[Halo.Bungie.Org|Bungie Sightings]]|date=2003-03-05|access-date=2007-10-04}} – Condensed version of information found at [http://www.larryniven.org/chatlogs/chat060402.shtml Niven's own site] {{webarchive|url=https://web.archive.org/web/20090220160506/http://www.larryniven.org/chatlogs/chat060402.shtml |date=2009-02-20 }}</ref>
* "All in Fun" by Jerry Oltion, in ''[[Fantasy & Science Fiction]]'', January 2009, mentions a faithful big-budget movie adaptation of ''Ringworld''.
* In [[Ernest Cline]]'s 2011 novel ''[[Ready Player One]]'', one of the sectors of the OASIS, the worldwide [[virtual reality]] network that is the novel's primary setting, is mentioned as being an adaptation of ''Ringworld''.
* The 1987 novel ''The Alexandrian Ring'' by [[William R. Forstchen]] takes place on a ring much like Niven's.
* Episode 5 of ''[[The Book of Boba Fett]]'' features a station called Glavis that is shaped like a ring and features sun shades in much the same way that Niven's does.
* The [[Orion's Arm]] worldbuilding setting has ringworlds as one type of megastructure, with direct reference to Niven as the one who came up with the idea. Most use super-strong magmatter in their construction (similar to the scrith in Niven's Ringworld), though the first ringworlds in Orion's Am instead use the same technology used in [[orbital ring]]s.<ref>{{Cite web |title=Ringworlds |url=http://www.orionsarm.com/eg-article/5151b9b79834e |access-date=2025-07-21 |website=Orion's Arm - Encyclopedia Galactica}}</ref>
* Niven himself, along with co-author [[Gregory Benford]], later wrote about a similar concept in the ''Bowl of Heaven novel'' series. The eponymous Bowl, rather than being a ring, is shaped like a bowl with a hole in the bottom. It essentially combines the Ringworld design with that of a [[stellar engine]]: reflective surfaces on the Bowl reflect some of the central star's light back onto a small portion of the star, causing it to produce a jet that passes through the bottom hole of the Bowl. The star is pushed by this jet, and the Bowl (linked to it by gravity) is brought along as well.<ref>{{Cite web |title=Building the Bowl of Heaven {{!}} Centauri Dreams |url=https://www.centauri-dreams.org/2014/06/30/building-the-bowl-of-heaven/ |access-date=2025-07-28 |website=www.centauri-dreams.org}}</ref>

==Books in series==

* ''Ringworld'' (1970)
* ''[[The Ringworld Engineers]]'' (1979)
* ''[[The Ringworld Throne]]'' (1996)
* ''[[Ringworld's Children]]'' (2004)
* ''[[Fleet of Worlds]]'' (2007)
* ''[[Juggler of Worlds]]'' (2008)
* ''[[Destroyer of Worlds (novel)|Destroyer of Worlds]]'' (2009)
* ''[[Betrayer of Worlds]]'' (2010)
* ''[[Fate of Worlds|Fate of Worlds: Return from the Ringworld]]'' (2012)

==See also==
{{Portal|Novels}}
{{div col|small=yes|colwidth=20em}}
* [[Bishop Ring (habitat)]]
* [[Dyson sphere]]
* [[Megastructure]]
* [[Orbital (The Culture)]]
* [[Orbital ring]]
* [[Stanford torus]] 
{{div col end}}

==References==
{{Reflist}}

==External links==
* [https://web.archive.org/web/20101019021242/http://www.freewebs.com/knownspace/rw.htm The Incompleat Known Space Concordance—Appendix: The Ringworld]
* [http://www.oinc.net/knownspace/enc/display.php?447 Encyclopedia of Known Space: Ringworld]
* [http://www.alcyone.com/max/reference/scifi/ringworld.html Physical parameters of the Ringworld]
* [http://www.worldswithoutend.com/novel.asp?ID=18 Ringworld] at Worlds Without End
* [http://www.larryniven.net/physics.shtml The Physics of Ringworld] {{Webarchive|url=https://web.archive.org/web/20180418072051/http://www.larryniven.net/physics.shtml |date=2018-04-18 }} (official site)
** [http://www.larryniven.net/physicsinscifi/img7.shtml ''Aspects of Ringworld''] {{Webarchive|url=https://web.archive.org/web/20160124094457/http://larryniven.net/physicsinscifi/img7.shtml |date=2016-01-24 }}
* [http://www.orionsarm.com/eg-article/5151b9b79834e Ringworlds]
* [https://www.theguardian.com/books/booksblog/2010/jul/02/larry-niven-ringworld]

{{Ringworldseries}}
{{Larry Niven}}
{{Hugo Award Best Novel 1971–1980}}
{{Locus Award Best Novel}}
{{Nebula Award Best Novel}}
{{Authority control}}

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