Triangle (Korean: 트라이앵글; RR: Teuraiaenggeul) is a 2014 South Korean television series, starring Lee Beom-soo, Kim Jae-joong and Im Si-wan. It aired on MBC from May 5 to July 29, 2014 on Mondays and Tuesdays at 22:00 (KST) for 26 episodes. Triangle was directed by Yoo Cheol-yong and written by Choi Wan-kyu, who previously collaborated on the gambling dramas All In (2003) and Swallow the Sun (2009).

Separated in childhood by unfortunate circumstances, three brothers meet twenty years later, unaware of their connection to each other.

The drama achieved both domestic and international success, ranking among the most-watched dramas during its run in South Korea and its rights being sold internationally to multiple Asian countries.