Triangle (disambiguation)
The term triangle may refer to:

 Triangle, a three-sided shape
 Triangle (instrument), a musical instrument with a three-sided shape
 Bermuda Triangle, a mysterious place on Earth
 Delta Triangle, a mysterious place in space
 Eternal triangle, a love triangle
 Triangular envelopment, a classic battle posture

Real world
 Triangle (novel), a novel
 Triangle: Imzadi II, a novel
 The Triangle, a roleplaying game supplement
 The Triangle Campaign, a roleplaying game supplement