Triangle may refer to any of the following items:
- Mar'zan Triangle, a region (from Decipher's RPG)
- Triangle (novel), a TOS novel by Sondra Marshak & Myrna Culbreath
- Triangle: Imzadi II, a TNG novel by Peter David
- The Triangle, an independent region at a conjunction of Federation, Klingon, and Romulan space. (from the FASA RPG)
- The Triangle (book), a FASA game sourcebook detailing "the Triangle" (see above). (from the FASA RPG)
- The Triangle Campaign, a FASA RPG game scenario book
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