Martin Goodman "Marty" Cohn (May 5, 1893 – November 18, 1953)^[1][2] was an American film editor and film producer who worked on B-movie genre pictures in Hollywood from the 1910s through the 1940s.^[3][4]

Cohn was born in New York City to Goodman Cohn and Jennie Nathan.^[1] His parents were Jewish immigrants. He married Anna Messing in Brooklyn in 1916. He began working as a film editor in the early 1910s, although like most editors of that era, he was not credited onscreen for his efforts.^[5] Eventually the family moved from New York City to Los Angeles, where he continued his career. He worked with Tiffany Pictures until its bankruptcy in 1932.^[6]

He was a founding member of the Society of Motion Picture Film Editors (a precursor to the Motion Picture Editors Guild) in 1937; early on, he served as treasurer.^[7] In the 1930s, he began working as a producer on projects, although editing seems to have continued to be his primary focus.^[8] During this time, he was credited with pioneering the "change-over," a technique that allowed projectionists to keep a film running without stopping to change reels.^[8]

He died in 1953 in Hollywood, where he had lived for 28 years.^[1] He was survived by his wife, Anna, and his son, Quinn Martin (who later became a famous TV producer).^[1][9][10] His brother Elias worked in Hollywood as a cameraman.^{[citation needed]}