Signe Toly Anderson ( born Signe Toly; September 15, 1941 – January 28, 2016) was an American singer who was one of the founding members of the American rock band Jefferson Airplane.

Signe Toly was born in Seattle, Washington on September 15, 1941. Her parents divorced when she was three, and her mother raised her in Portland, Oregon. Toly sang in a band with three male musicians she had known in high school, under the name Three Guys and a Gal. The group performed at a campaign event for John F. Kennedy in November 1959.

Toly was a locally-known and well-respected jazz and folk singer in San Francisco, where Marty Balin heard her perform and invited her to join his band, soon named Jefferson Airplane.