Michael Edward O'Malley (born October 31, 1966) is an American actor. Born in Boston and raised in New Hampshire, O'Malley hosted the early 1990s children's game show Nickelodeon Guts before moving to Los Angeles later that decade to star in his own sitcom for NBC called The Mike O'Malley Show. He is best known for his role as Jimmy Hughes on Yes, Dear, a CBS series which aired from 2000 to 2006. He was nominated for an Emmy Award for his role as Burt Hummel on the Fox series Glee.

O'Malley has also guest-starred in series including My Name Is Earl, Raising Hope, Parenthood and Parks and Recreation, and has appeared in films including 28 Days, Deep Impact, Leatherheads, Eat, Pray, Love, R.I.P.D., Concussion and Sully.

O'Malley is also a published playwright whose plays include Three Years From Thirty and Diverting Devotion. He adapted another play called Searching for Certainty for Peter Askin's film Certainty, which premiered at the Boston Film Festival in 2011. O'Malley was also a writer on Showtime's comedy-drama Shameless.

O'Malley was the creator and an executive producer of the Starz series Survivor's Remorse, which ran for four seasons between 2014 and 2017. He has recently been a regular on the TNT series Snowpiercer based on the movie of the same name.