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{{Short description|Professional-social fraternity of engineers}}
{{No footnotes|date=November 2025}}{{Infobox fraternity
| name = Sigma Phi Delta
| letters = {{lang|grc|ΣΦΔ}}
| crest = Sigma Phi Delta Coat of Arms.svg
| image_size = 180px
| founded = {{start date and age|1924|4|11}}
| birthplace = [[University of Southern California]]
| motto = {{lang|la|Pro Bono Professionis}}<br>"For the Good of the Profession"
| former_affiliation = PFA
| former_affiliation2 = NIC
| type = Social fraternity
| status = Active
| emphasis = [[Professional fraternities and sororities|Professional]] - [[Engineering]]
| scope = North America
| colors = {{Color box|#FF0000|border=darkgray}} [[Red]] and {{Color box|#000000|border=darkgray}} [[Black]]
| flower = [[Rosa 'American Beauty'|American Beauty Rose]]
| publication = ''The Castle''
| symbol = Castle
| chapters = 25 active, 15 inactive
| address = PO Box 679
| city = [[Burlington, New Jersey|Burlington]]
| state = [[New Jersey]]
| ZIP code = 08016
| country = United States
| homepage = {{URL|http://www.sigmaphidelta.org}}
}}
'''Sigma Phi Delta''' ('''{{lang|grc|ΣΦΔ}}''') is an international [[Professional fraternities and sororities|professional]]-[[List of social fraternities and sororities|social]] [[Fraternities and sororities in North America|fraternity]] of [[engineer]]s. As "The Premier International Fraternity of Engineers", the organization is the only fraternity of its kind that draws its membership exclusively from male [[engineering]] students at [[ABET]]-accredited colleges and universities, as other similar organizations are co-ed or admit students not strictly in traditional engineering programs (such as architecture or technical sciences).

==History==
Sigma Phi Delta was founded at [[University of Southern California]] on April 11, 1924 and currently has 25 active chapters.

==Symbols==
===Coat of Arms===
The description of the crest, using heraldic language, is: Gules, a pall or, between, in chief two retorts crossed argent, in dexter base a quill sable surmounting a key in saltire, of the third, in sinister base a hammer fesswise of the fourth debruising a compass, points downward, of the third; over all the escutcheon of pretense, azure, charged with a castle or, masoned sable, with a bordure argent. The crest, over a duke's helmet and a torse of the colors, is a dexter cubit arm, proper, grasping a thunderbolt, winged or. Its mantling is Gules doubled. Its supporters are two lions rampant, proper. Below is the motto of Sigma Phi Delta, in upper and lower case Greek letters <!-- "or" used here means gold.-->

===Insignia===
The name of the fraternity is represented by the capital form of the Greek letters Sigma (Σ), Phi (Φ), Delta (Δ) which stand for Science, Friendship and Duty.

===Badge===
The member's badge is described as: "A triangle having concave corners on which are superimposed three smaller triangles having concave sides and having their vertices at the center of the badge on which is placed a ruby. The smaller triangles, which contain the letters Sigma, Phi and Delta, are black, the background between them being white. A gold star is located near each of the vertices of the large triangle. The border may be engraved gold or may be jeweled. The crown pearl badge has four pearls on each side of the badge. The ruby point badge has two rubies and two pearls on each side, the pearls being in the middle and the rubies at the outside".

===Pledge pin===
The pledge pin is described as: "A red triangular background on which is a black Castle, the whole bordered in gold".

===Fraternity flag===
The fraternity flag is 4 feet by 6 feet, made of cotton bunting or nylon. The design is black letters, bordered with white and a gold Castle on a red field. This is a standard flag, that is, read correctly from left to right on one side and in reverse on the other.

== Partnerships ==
{{Advert section|date=November 2025}}

In 2015, Sigma Phi Delta and [[Alpha Omega Epsilon]] joined together to form a strategic partnership with the [[FIRST Robotics Competition]] in order to fulfill their respective mission to further Engineering Education. Together, they plan to advocate and promote career opportunities in STEM, within grades K–12 as well as higher education, build on existing STEM related programs, and seek ways to engage their memberships in FIRST Mentor/Coach opportunities as a means of workforce development, increased community involvement and/or encourage employees to give back to the communities where they live/work. Most Sigma Phi Delta chapters were already involved with their respective communities FIRST teams, but this further cements Sigma Phi Delta's object of further Engineering as a whole.

== Chapters ==
{{main|List of Sigma Phi Delta chapters}}

==Notable members==
* [[Eric Newell]] (''Theta chapter'') – Former Chairman and CEO of the oil company [[Syncrude]]. Chancellor of the [[University of Alberta]].

==See also==

* [[Professional fraternities and sororities]]

==References==
{{reflist|colwidth=30em}}
*{{Cite book
  | last1 =Anson
  | first1 =Jack L.
  | author-link = Jack L. Anson
  | last2 = Marchesani
  | first2 = Robert F.
  | title =[[Baird's Manual of American College Fraternities]]
  | place = Indianapolis
  | publisher = Baird's Manual Foundation, Inc.
  | year =1991
  | edition =20th
  | pages = V 56–57
  | isbn = 0-9637159-0-9
  }}

{{Fraternities and Sororities |collapsed}}
{{Professional Fraternities}}
{{North American Interfraternity Conference}}

[[Category:Sigma Phi Delta| ]]
[[Category:Student organizations established in 1924]]
[[Category:Professional fraternities and sororities in the United States]]
[[Category:Student societies in the United States]]
[[Category:Active former members of the North American Interfraternity Conference]]
[[Category:Former members of Professional Fraternity Association]]
[[Category:1924 establishments in California]]