Mark Mulcahy is an American musician and singer-songwriter from the United States. He is best known as the former frontman of Miracle Legion, where he serves as lead singer until the band ends in 1996. Miracle Legion tours widely and appears on MTV and Late Night with David Letterman.

After Miracle Legion, Mulcahy releases several solo recordings, including Fathering, SmileSunset, In Pursuit of Your Happiness and the EP Love’s the Only Thing That Shuts Me Up. He later releases Dear Mark J. Mulcahy, I Love You, his first full-length album in eight years. His work is associated with indie, classic pop and rock, and he releases music through Mr. Myxplyxtlx Music.

Mulcahy also composes music for the Nickelodeon series The Adventures of Pete and Pete, performing with the fictional band Polaris, which includes three-fourths of the Miracle Legion lineup. He writes music for the films Spring Forward, The Crush and A Matter of Degrees, and is featured in Nick Hornby’s essay collection Songbook. He also collaborates with writer and artist Ben Katchor on the musicals The Rosenbach Company and The Slug Bearers of Kayrol Island, or, The Friends of Dr. Rushower, and performs “Don’t Talk Crazy” with Michael Stipe at the “Bring ’Em Home Now” concert in New York City in 2006.