Louise Platt (August 3, 1915 – September 6, 2003[1]) was an American theater, film, and TV actress.

[2] Platt's first professional acting experience came in stock theater in Suffern, New York.

[4] Her Broadway credits include The Traitor (1949), Anne of the Thousand Days (1948), Five Alarm Waltz (1941), In Clover (1937), Promise (1936), Spring Dance (1936), and A Room in Red and White (1936).

[5] Platt is best remembered for her role as the officer's pregnant wife in John Ford's Stagecoach (1939).

She worked with Rex Harrison in Anne of the Thousand Days on Broadway in 1948 and in the 1950s played a variety of roles on television, including two appearances on Alfred Hitchcock Presents and a recurring role as Ruth Holden on The Guiding Light.