Mary Maguire Alden (June 18, 1883 – July 2, 1946) was an American motion picture and stage actress.

A sampling of movies in which she had roles are The Plastic Age (1925), The Joy Girl (1927), Ladies of the Mob (1928), and Port of Dreams (1929).

The final films she received screen credit for are Hell's House, Rasputin and the Empress, and Strange Interlude, each from 1932.

Alden died at the Motion Picture & Television Country House and Hospital in Woodland Hills, Los Angeles, California in 1946, aged 63 years.

[1] Alden was interred in an unmarked grave under her married name of Deangman in Valhalla Memorial Park Cemetery in North Hollywood, California.