Sidney Blackmer (13 Julie 1895 – 6 Oktober 1973) was 'n Amerikaanse akteur. Hy was bekend vir sy rolle in die rolprente The Count of Monte Cristo (1934), In Old Chicago (1938), High Society (1956), en Rosemary's Baby (1968). 1929: The Love Racket 1929: A Most Immoral Lady 1930: Kismet 1930: Strictly Modern 1930: Sweethearts and Wives 1931: Woman Hungry 1931: It's a Wise Child 1931: The Lady Who Dared 1933: Cocktail Hour 1933: Deluge 1933: From Hell to Heaven 1933: The Wrecker 1933: Goodbye Love 1934: The Count of Monte Cristo 1935: Behind the Green Lights 1935: False Pretenses 1935: The Fire-Trap 1935: Forced Landing 1935: The Girl Who Came Back 1935: Great God Gold 1935: A Notorious Gentleman 1936: Heart of the West 1936: Missing Girls 1936: The President's Mystery 1936: Woman Trap 1936: The House of Secrets 1937: Charlie Chan at Monte Carlo 1937: The Women Men Marry 1938: In Old Chicago 1939: Convict's Code 1940: Framed 1942: Gallant Lady 1942: The Panther's Claw 1942: Sabotage Squad 1950: Farewell to Yesterday 1951: Saturday's Hero 1952: The San Francisco Story 1952: Washington Story 1955: The View from Pompey's Head 1956: High Society 1956: Accused of Murder 1956: Beyond a Reasonable Doubt 1968: Rosemary's Baby 1971: Revenge Is My Destiny 1958: Pursuit 1963: Saga of Western Man 1952: Refresher Course 1953: Never Kick a Man Upstairs 1956: The Little Foxes 1963: A Tribute to John F. Kennedy from the Arts 1964: The Presidency: A Splendid Misery 1970: Howdy 1971: Do You Take This Stranger?