Teenage Mutant Ninja Turtles, known as Geki Kame Ninja Den[a] in Japan and Teenage Mutant Hero Turtles in Europe, is a 1989 side-scrolling action-platform game for the Nintendo Entertainment System released by Konami. In North America it was published under Konami's Ultra Games imprint in the US and the equivalent PALCOM brand in Europe and Australia.

Alongside the arcade game (also developed by Konami), it was one of the first video games based on the 1987 Teenage Mutant Ninja Turtles animated series, being released after the show's second season. The game sold more than 4 million cartridges worldwide.