Maggie May Baird (born March 29, 1959) is an American actress, activist, and singer-songwriter. She grew up in Colorado performing music, and studied theater and dance at the University of Utah, before moving to New York City, where she performed on Broadway. She made her television debut in 1981 in the soap opera Another World and her film debut in An Innocent Man (1989).

Baird continued to act in television and film after moving to Los Angeles in 1991, and became a member and teacher at the Groundlings, a troupe and improvisational theatre school. She acted in 2000s television series, such as Bones, The X-Files and Six Feet Under, and provided the voices of Samara in the video game series Mass Effect, and various characters in the Saints Row game series. In 2009, Baird released her debut studio album, We Sail.

Baird married Patrick O'Connell in 1995, with whom she has two children: musicians Finneas O'Connell and Billie Eilish. She wrote and co-starred with her son Finneas in the film Life Inside Out (2013), which garnered Baird critical acclaim for her performance. In 2016, she edited the music video for "Six Feet Under" for her daughter Billie.