Sean Leslie Flynn (born May 31, 1941, in Los Angeles, California; disappeared April 6, 1970, in Cambodia, age 28; declared legally dead in 1984 ) was an American actor and freelance photojournalist (photojournalism) best known for his coverage of the Vietnam War. He started a news service in Saigon with John Steinbeck IV, son of the American author (John Steinbeck).

Flynn was the only child of the marriage of Errol Flynn and Lili Damita. After studying briefly at Duke University, he became a movie actor like his parents. When he tired of acting, Flynn became a freelance photojournalist under contract to Time (Time (magazine)). In a search for exceptional images, he attached himself to Special Forces units and even irregulars operating in remote areas.