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John Francis Larkin Jr. (1901–1965) was an American screenwriter.

Larkin was from New York City. His credits range from 1932 to 1950, amounting to about 30 films, and include:

• Ladies Must Love (1933)
• Charlie Chan at Treasure Island (1939)
• Charlie Chan in Panama (1940)
• The Lone Wolf Meets a Lady (1940)
• Charlie Chan at the Wax Museum (1940)
• Dead Men Tell (1941)
• Manila Calling (1942)
• Castle in the Desert (1942)
• Quiet Please, Murder (1942)
• Buffalo Bill (1944) (uncredited)
• The Dolly Sisters (1945)
• Cloak and Dagger (1946)
• Carnival in Costa Rica (1947)
• Two Weeks with Love (1950)

• John Larkin at IMDb