Mary Aileen Conquest-Allen (December 22, 1888 – September 4, 1950) was an American diver who competed in the 1920 Summer Olympics.

[2] In 1913, Allen was one of the founding members of an all-woman swimming club at the Bimini Baths in Los Angeles, California, which was formed in response to strict dress codes imposed by other clubs.

Her most notable role was Mrs. Westfall in the 1916 Metro Pictures release Mister 44.

[2] During the 1928 Summer Olympics, Allen served as the coach for the United States women's track and field team.

[6] She coached the United States women's swim team during the 1932 Summer Olympics.