Helen Rachel Slater (born December 15, 1963) is an American actress, singer and songwriter. She played the title role in the 1984 film Supergirl, and returned to the TV series of the same name. In the following years, she starred in several comedy-drama films such as Ruthless People (1986), The Secret of My Success (1987), and City Slickers (1991). She additionally found work as an actress in television, and stage projects, including three guest appearances on the series Smallville (2007–2010). She was a series regular for the two-season run (2011–2013) on the ABC Family series The Lying Game.

In the 2000s, Slater recorded five albums, singing her own compositions and playing the piano.