Lee Min Woo (born July 28, 1979) is a backup-singer and member of the Korean boy band Shinhwa. Lee was the fourth member picked for the group. As part of Shinhwa, he has recorded nine studio albums as a vocalist and a rapper. Though he left the group's management company in early 2007, Lee has stated that he is still part of Shinhwa and that the band will never disband.

Lee first started his solo act in 2003 when his band was on hiatus. He has since released three successful studio albums. As a solo artist, Lee changed his stage name to M. Aside from singing, Lee has also appeared in Korean television dramas and movies, with and without his bandmates. Throughout his career with Shinhwa, Lee has change his looks along with his bandmates. From having a cute image in the early days and transitioning to various looks, Lee and his bandmates never lost their strong fanbase.