忍者神龟（英语：Teenage Mutant Ninja Turtles，缩写TMNT，简称Ninja Turtles），是由4只基因突变的乌龟所组成的忍者团体，并得到史林特师父的忍术训练和指导。他们住在纽约曼哈顿的下水道，夜间出动，打击街头犯罪、邪恶势力和外星入侵，同时他们始终和外界社会保持距离。这些人物最早在漫画里登场，随后广泛的出现在授权改编的动画片、电影和玩具中。

The Teenage Mutant Ninja Turtles (often shortened to TMNT or Ninja Turtles) are four fictional teenage anthropomorphic turtles who are named after four Renaissance Italian artists. They were trained by their anthropomorphic rat sensei in the art of ninjutsu. From their home in sewers of New York City, they battle petty criminals, evil overlords, mutated creatures, and alien invaders while attempting to remain hidden from society. They were created by Kevin Eastman and Peter Laird.