Omega Man, The (1971) by John William Corrington. Based on the novel "I Am Legend" by Richard Matheson. Draft script, 7/18/70.

One Flew Over The Cuckoo's Nest (1975) by Lawrence Hauben. Based on the novel by Ken Kesey.

One Good Turn (1930) by ?

Only You (1994) by Diane Drake.

Out Of Sight (1998) by Scott Frank, production draft. From the novel by Elmore Leonard.