Samuel Alexander O'Steen (November 6, 1923 – October 11, 2000) was an American film editor and director. He had an extended, notable collaboration with the director Mike Nichols, with whom he edited 12 films between 1966 and 1994. Among the films O'Steen edited are Who's Afraid of Virginia Woolf (directed by Nichols, 1966), Cool Hand Luke (directed by Stuart Rosenberg, 1967), The Graduate (directed by Nichols, 1967), Rosemary's Baby (directed by Roman Polanski, 1968), and Chinatown (directed by Polanski, 1974).