Team Ninja is a Japanese video game developer, and a division of Koei Tecmo, founded in 1995 as a part of Tecmo. It was founded by Tomonobu Itagaki, and is best known for franchises such as Ninja Gaiden, Dead or Alive and Nioh.

Koei Tecmo Holdings Co., Ltd. is a Japanese video game, amusement and anime holding company created in 2009 by the merger of Koei and Tecmo. Koei Tecmo Holdings owns several companies, the biggest one of those being its flagship video game developer and publisher Koei Tecmo Games that was founded in 1978 as Koei.