Mia Dillon (born July 9, 1955) is an American actress.Born in Colorado Springs, Colorado, Dillon graduated from Marple-Newtown Senior High School in Newtown Square, Pennsylvania. She made her Broadway debut in Hugh Leonard's Da in 1978. She was nominated for the 1980 Drama Desk Award for Outstanding Featured Actress in a Play for Once a Catholic, and the 1982 Tony Award for Best Featured Actress in a Play for Crimes of the Heart.