Updated: July 14, 2022

Sheila Mathews Allen (February 2, 1929 – November 15, 2013) was an American actress.

Born Sheila Marie Mathews in New York City to Christopher Joseph and Elizabeth (née McCloskey) Mathews, both immigrants from Ireland. She was married to producer Irwin Allen until his death in 1991. She appeared in several of her husband's TV series and movies through to 1986. Appearances include City Beneath the Sea, Lost in Space, Land of the Giants, The Poseidon Adventure and The Towering Inferno. Following his death in 1991 she remained on the board of Irwin Allen Productions up until her death. She also served as a producer on the 2002 television remake of The Time Tunnel and as Executive Producer of the film Poseidon.

She died on November 15, 2013 at her home in Malibu, California, after an extended battle with pulmonary fibrosis.