Mary Claire Fuller was an American actress active in both stage and silent films. She also was a screenwriter and had several films produced. An early major star, by 1917 she could no longer obtain roles in film or on stage. A later effort to revive her career in Hollywood failed in the 1920s after talkies began to dominate film. After suffering a nervous breakdown, she was admitted to St. Elizabeths Hospital in Washington, DC in 1947 and lived there until her death.

St. Elizabeths Hospital is a psychiatric hospital in Southeast Washington, D.C. operated by the District of Columbia Department of Mental Health. The hospital opened in 1855 under the name Government Hospital for the Insane, the first federally operated psychiatric hospital in the United States.