Triangle Staff Corp. (Japanese: 有限会社トライアングルスタッフ, Hepburn: Yūgen-gaisha Toraianguru Sutaffu) was a Japanese animation studio established in 1987 from former Madhouse staff, producing series such as Macross Plus, Serial Experiments Lain, and NieA_7. The studio ceased operations in 2000, when they were set to do the animation production on WXIII: Patlabor the Movie 3.