New York Ninja is a 2021 American action film written, directed by and starring John Liu. It was shot in 1984, but was not edited or released until 2021, when its footage was discovered and restored by the film preservation and home video distributor Vinegar Syndrome.

New York Ninja was filmed in New York City, and was shelved after its original distribution company went bankrupt. The abandoned footage was eventually acquired by Vinegar Syndrome; without audio, storyboards, or scripts for the film, it was reconstructed by a new director, Kurtis M. Spieler, and dubbed dialogue was recorded by actors including Don "The Dragon" Wilson, Michael Berryman, Cynthia Rothrock, Linnea Quigley, Vince Murdocco, Matt Mitler, Leon Isaac Kennedy, and Ginger Lynn Allen.