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{{wiktionary|quad|quadri-}}

'''Quad''' as a word or prefix usually means [[4]]. It may refer to:
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==Government==
* [[Quadrilateral Security Dialogue]], a strategic security dialogue between Australia, India, Japan, and the United States
* [[Quadrilateral group]], an informal group that includes the trade spokesmen of the United States, Japan, Canada, and the European Union
* [[I2U2 Group]], a strategic partnership between the United States, India, Israel, and United Arab Emirates; also known as the "Middle East Quad"
* [[Quad Cities]], a group of five cities straddling the boundary between the U.S. states of Iowa and Illinois
* The "Quad", the senior members of the [[Cameron–Clegg coalition]] government in the United Kingdom from 2010 to 2015

==Art and entertainment==
* [[Matthias Quad]] (1557–1613), engraver and cartographer
* [[Quad (film)|''Quad'' (film)]], 2015
* [[Quad (music)]], a musical project by Gary Ramon
* [[Quad (play)|''Quad'' (play)]], by Samuel Beckett
* [[The Quad (TV series)|''The Quad'' (TV series)]], 2017
* [[Quad (arts centre)]], in Derby, United Kingdom
* [[Quad Cinema]], art house in New York City, New York
* [[Quad (studio)]], a Japanese animation studio
* [[Quadruple combination]], the four books that comprise the canon of the LDS church

== Business ==

* [[Quad (company)]], an American marketing solutions company
* [[Quad Electroacoustics]], a British manufacturer of audio equipment

==Medicine and anatomy==
* [[Quadriplegic]], a person paralyzed in all four limbs
* [[Quadriceps]], a large leg muscle group
* [[Quadruplets]], four children from a multiple birth

==Sports==
* [[Quad (figure skating)]], a figure skating jump with four revolutions
* [[Quad scull]], a boat configuration of four rowers
* [[Quad skates]], roller skates with two wheels on each of two axles
* Quad, one of the divisions in [[wheelchair tennis]]
* [[Quadruple-double]], a statistical accomplishment in basketball 
* [[Quadrennium]], the 4-year training cycle between Olympic games<!--Technically any 4-year period is a quadrennium, but the term is particularly used in sports-->

==Transportation==
* [[Quad bike]] or all-terrain vehicle, a vehicle that travels on low-pressure tires
* Quad, a [[tandem bicycle]] with four seats
* [[Quadracycle]], a four-wheeled human-powered land vehicle
* [[Jeffery Quad]], a four-wheel drive truck
* [[Quadcopter]], a four-rotor helicopter
* Quad, a [[chairlift]] in skiing which carries four persons
* Quad, or [[railroad speeder]], a motorized vehicle used for maintenance on railroads
* [[Quad (rocket)]], an autonomous rocket by Armadillo Aerospace

==Technology==
* [[QUAD (cipher)]], a stream cipher
* [[QUaD]], a microwave telescope at the South Pole
* [[Quad antenna]], a directional antenna
* [[Quadraphonic sound]], four-channel sound
* [[Quadruplex videotape]], video tape format
* [[Quad Flat Package]], a type of package for surface mounted integrated circuit
* [[Star quad cable]], four insulated conductors twisted together

==Other uses==
* [[Quad (unit)]], unit of energy, short for ''quadrillion'', 10<sup>15</sup> BTU
* [[Quadrangle (architecture)]], a space or courtyard bordered by buildings
* [[Quad (geography)]], a United States Geological Survey topographical map
* [[Quad (typography)]], a spacer used in letterpress type
* [[Quadrilateral]], in geometry
* Quad poster, a common UK size of [[film poster]]
* [[Quadrat]], in ecology, a small study area or a frame used to define it
* [[Quadrupel]], a Belgian beer
* [[The Linq|The Quad Casino]] (now The Linq), on the Las Vegas Strip
* [[Four-of-a-kind]] in poker
* [[Sako Quad]], a Finnish bolt-action rifle
* [[Morris C8]], a WWII era artillery tractor

==See also==
* [[Quadrangle (disambiguation)]]
*{{in title|Quad}}

{{disambiguation|surname}}