M (Korean: 엠) is a 2007 South Korean psychological drama film starring Gang Dong-won, Lee Yeon-hee and Gong Hyo-jin. The film premiered at the Toronto International Film Festival, and the final cut had its Korean premiere at the Pusan International Film Festival.

Using visual effects, complex dream sequences, and gliding camerawork, director Lee Myung-se describes his film as "a dark labyrinth of dream and reality," and that instead of using computer graphics, he prefers to "capture the fantasy elements through lighting and emotions."