Mary Martha Byrne (born December 23, 1969 in Ridgewood, New Jersey) is an American actress, singer and screenwriter.
She currently serves as a script writer for the CBS Daytime soap opera The Bold and the Beautiful. Recently, she left the daytime soap on CBS's As the World Turns as the passionate role of Lily Snyder, and she joined the cast of ABC's General Hospital as Andrea Floyd.
Byrne began acting at a young age when she joined the cast of the Broadway musical Annie, where she played the role of July.
She was a featured actor on a number of prime time episodic television programs, including Kate and Allie, Murder, She Wrote, Parker Lewis Can't Lose, Jake and the Fatman, In the Heat of the Night, and Hearts are Wild. Byrne also appeared in several television movies, with featured roles in When the Cradle Falls and Pink Lightning.
Byrne's best known movie role would be the title character in the 1983 movie Anna to the Infinite Power, and in 2010 provided the commentary for the DVD release.
Byrne is best known for her role on the CBS Daytime soap opera As the World Turns, portraying Lily Walsh Snyder. She initially assumed the role from Lucy Deakins in May 1985 and played Lily