Sean Muir (born Sean Muir Alaback, April 22 1983 in Corvallis, Oregon) is an American playwright.

Muir grew up in both Juneau, Alaska and Missoula, Montana. In 2001 he graduated from Hellgate High School and shortly thereafter moved to Los Angeles, California. He enrolled in East Los Angeles College as an English/Political Science major but dropped out after his first year. Muir’s first play, Scathed, was produced in West Hollywood, California.