Triangle (トライアングル, Toraianguru) was a Japanese pop group that formed and debuted in the late 1970s.
They released their first single, Triangle Love Letter in mid 1978 and their last single, Koi wa Tekkiri Ba-Bi-Bu-Be-Bo in 1980.
The group only released two albums, Triangle Love Letter and Sanjūsō / Triangle 2 in 1978 and 1979 respectively.
Sony Music Entertainment released Triangle Single Collection in 2008.