Louise Troy (November 9, 1933 — May 5, 1994) was an American actress of stage and screen. She is best known for her performances in Tovarich (1963) and Walking Happy (1966), both of which she was nominated for a Tony Award. Her signature stage role was that of the lead in High Spirits (1964).

She studied at the American Academy of Dramatic Arts and made her Broadway debut in the musical Pipe Dream. She received critical acclaim for her role opposite Edward Woodward in the 1964 musical High Spirits, which was based on Noël Coward's comedy, Blithe Spirit. She was a three-time Tony Award nominee and was also known for her guest appearances on the television show Hogan's Heroes, on which her then husband Werner Klemperer starred as "Colonel Klink". She appeared in three other television shows, Room 222, Kate and Allie and Honey West. In the 1970s, she appeared on CBS television's daytime drama The Guiding Light, twice, as Audrey Frost Mills in 1974 and as Gladys Shields in 1978. Troy also appeared in two movies, Yours, Mine and Ours and The Swimmer.