Margaret Julia "Marlo" Thomas (born November 21, 1937) is an American actress, producer, author, and social activist. She is best known for starring on the sitcom That Girl (1966–1971) and her children's franchise Free to Be... You and Me. She has received three Primetime Emmy Awards, a Daytime Emmy Award, a Golden Globe Award, a Peabody Award for her work in television and has been inducted into the Broadcasting and Cable Hall of Fame.

She has also received a Grammy Award for her children's album Marlo Thomas and Friends: Thanks & Giving All Year Long. In 2014, she was awarded the Presidential Medal of Freedom.Thomas serves as National Outreach Director for St. Jude Children's Research Hospital, which was founded by her father Danny Thomas in 1962. She created the Thanks & Giving campaign in 2004 to support the hospital.