Triangle (Korean: 트라이앵글; RR: Teuraiaenggeul) is a 2009 South Korean-Japanese comedy film starring Ahn Jae-wook, Kang Hye-jung and Lee Soo-kyung. A tense standoff between a wealthy young widow with a collection of world-famous art, a swindler with an eye on her collection, and a strange woman who blackmails him into including her in the con.

It was part of the "Telecinema7" project, seven feature-length mini-dramas which were collaborations between South Korean TV directors and Japanese TV screenwriters; the seven Korea-Japan joint productions both received a limited theater release and were broadcast on television. Triangle was first released in Korea in CGV theaters on November 29, 2009, and later aired on SBS (South Korea) and TV Asahi (Japan) in 2010.