Ninja Gaiden III: The Ancient Ship of Doom is a side-scrolling platform video game developed and published by Tecmo. It was released in Japan on June 21, 1991 for the Famicom and in North America on August 1991 for the Nintendo Entertainment System (NES). The NES version was not released in Europe. It was later ported to the Atari Lynx by Atari Corporation and released in 1993 in North America and Europe, the European version retaining the North American Ninja Gaiden III title. It was also re-released as part of its Ninja Gaiden Trilogy Super NES compilation in 1995 in Japan and North America. Long after, it was released for the Virtual Console service in North America on February 18, 2008 for the Wii and in North America and Europe on November 28, 2013 and January 23, 2014 respectively for the Nintendo 3DS. It was designed by Masato Kato, who took over for Hideo Yoshizawa—designer of the first two games in the NES series.

Ninja Gaiden, released in Japan as Ninja Ryūkenden and as Shadow Warriors in Europe, is an action-platform video game developed and published by Tecmo for the Nintendo Entertainment System. Its development and release coincided with the beat 'em up arcade version of the same name. It was released in December 1988 in Japan, in March 1989 in North America, and in August 1991 in Europe. It has been ported to several other platforms, including the PC Engine, the Super NES, and mobile phones.