Marian Marsh (born Violet Ethelred Krauth; October 17, 1913 – November 9, 2006) was a Trinidad-born American film actress and later an environmentalist.

In 1928 she was approached by silent screen actress Nance O'Neil, who offered her speech and movement lessons, and with her sister Jean's help, she soon entered the movies.

She was seen in small roles in Howard Hughes's classic Hell's Angels (1930) and Eddie Cantor's lavish Technicolor musical Whoopee!

[5] In 1931, after appearing in a number of short films, Marsh landed one of her most important roles in Svengali opposite John Barrymore.

In the film version, Marsh plays the artist's model Trilby, who is transformed into a great opera star by the sinister hypnotist Svengali.

In 1932, in the midst of a grueling work schedule, Marsh left Warner Bros. and moved to RKO, where she made Strange Justice (1932) with Norman Foster and The Sport Parade (1932) with Joel McCrea.

During this time, she starred in such films as The Black Room (1935) regarded as one of Boris Karloff's best horror films of the decade, Josef von Sternberg's classic Crime and Punishment (1935) with Peter Lorre, wherein she played the sympathetic prostitute Sonya, Lady of Secrets (1936) with Ruth Chatterton, Counterfeit (1936) with Chester Morris, The Man Who Lived Twice (1936) with Ralph Bellamy, and Come Closer, Folks (1936) with James Dunn.

In her last screen appearance, Marsh portrayed the daughter of an inventor in the comedy/mystery House of Errors (1942), which starred Harry Langdon.

[6] In the 1960s, Marsh founded Desert Beautiful, a non-profit all-volunteer conservation organization to promote environmental and beautification programs.