Nobunaga's Ambition (信長の野望, Nobunaga no Yabō) is a turn-based strategy video game series first released in Japan in 1983. It is a series of loosely adapted historical simulations produced by the Japanese video game developer Koei. It features a predominately Japanese voice track though English dubs appear during movie cutscenes. It debuted before Romance of the Three Kingdoms but isn't localized as often.

March 30, 2013 marks the series's 30th year anniversary. There are several events and miniature campaigns taking place to celebrate it, many of which are located for easy viewing on its special website.

The iconic main theme heard in the opening credits and most promotional trailers for the series was composed by Yoko Kanno.