Teenage Mutant Ninja Turtles[a] is a 1990 American superhero action comedy film directed by Steve Barron and written by Todd W. Langen and Bobby Herbeck, from a story by Herbeck. It is the first film adaptation of the comic book characters created by Kevin Eastman and Peter Laird. It stars Judith Hoag and Elias Koteas with the voices of Brian Tochi, Robbie Rist, Corey Feldman, and Josh Pais. Teenage Mutant Ninja Turtles follows the Turtles on a quest to save their master, Splinter, with their new allies, April O'Neil and Casey Jones, from the Shredder and his Foot Clan.

The film adapts the early Teenage Mutant Ninja Turtles comics, with several elements taken from the animated series airing at the time. The turtle costumes were developed by Jim Henson's Creature Shop, one of Jim Henson's last projects before his death shortly after the premiere. Filming took place in 1989 in North Carolina and New York City.

Teenage Mutant Ninja Turtles was released theatrically in the United States on March 30, 1990, by New Line Cinema. It received mixed reviews, but was a box-office success, grossing $202 million on a budget of $13.5 million; it was the highest-grossing independent film up to that time[7] and the ninth highest-grossing film worldwide of 1990. It was followed by Teenage Mutant Ninja Turtles II: The Secret of the Ooze (1991) and Teenage Mutant Ninja Turtles III (1993). It is the only film in the original trilogy not to be distributed by 20th Century Fox internationally.