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Theodore Kosloff (left) in the 1921 Cecil B. DeMille directed Fool's Paradise. The film also starred Mildred Harris (center) and Conrad Nagel (right).

Theodore Kosloff (occasionally credited as Theodor Kosloff) (January 22, 1882 - November 22, 1956) was a Russian born ballet dancer, choreographer and film and stage actor.

Born in Moscow, Russia in 1882, Theodore Kosloff began his professional ballet career after training at Moscow's Imperial Theater. After graduating in 1901, he began touring internationally with the Diaghilev Ballet Company which he had joined in 1909. While touring with the company, Kosloff began a romantic relationship with fellow company member, the American future set-designer and Mrs. Rudolph Valentino, Natacha Rambova. The affair however, was brief and allegedly tumultuous.

After arriving in the United States of America in 1909, Kosloff was introduced to influential film director Cecil B. DeMille by the actress and writer Jeanie MacPherson. DeMille was also encouraged to sign Kosloff due to the persistence of his young niece Agnes de Mille, who was an ardent fan of the ballet dancer. DeMille was immediately impressed by the dark-haired young dancer and quickly put Kosloff to work as an actor. Kosloff's first role was in the 1917 DeMille directed The Woman God Forgot opposite the extremely popular American singer and actress, Geraldine Farrar.

Kosloff also worked steadily during his acting career as a choreographer and between 1915 and 1916 choreographed three Broadway musicals: The Passing Show of (1915-1916), A World of Pleasure (1915-1916) and See America First (1916). In 1918 through 1919 Kosloff also appeared on the stage as an actor in the revival of The Awakening.

Kosloff's career as a film actor spanned the 1920s and Kosloff often appeared as the leading man opposite such well renowned actresses as Nita Naldi, Gloria Swanson, Bebe Daniels and Anna Q. Nilsson. With his dark hair and complexion, the ballet dancer was often cast in more exotic roles, often as a "Latin lover" type, Eastern European prince or noble, or Arabic sheik. Kosloff's acting career often relied heavily on DeMille procuring roles for him in his films. Indeed, the majority of Kosloff's film roles are in DeMille directed films.

Kosloff's acting career came to an end with the advent of the "talkie". Studio executives were reluctant to cast him in roles because of his pronounced Russian accent. Kosloff's last film role was an uncredited role as (appropriately) a dance instructor in the 1937 Gregory La Cava directed Stage Door, opposite Ginger Rogers, Katharine Hepburn and Adolphe Menjou.

After retiring from acting, Kosloff continued to work as a choreographer and opened a successful ballet school in Los Angeles, California. Theodore Kosloff died in 1956 in Los Angeles at the age of 74 and was interred at the Pierce Brothers' Valhalla Memorial Park Cemetery in North Hollywood, Los Angeles County, USA.

For his contribution to the motion picture industry, Theodore Kosloff was given a star on the Hollywood Walk of Fame located at 1617 Vine Street, in Hollywood, California.

• Theodore Kosloff at the Internet Movie Database
• Theodore Kosloff at the Internet Broadway Database
• Theodore Kosloff at the New York Times Movies