One Flew over the Cuckoo's Nest

On the Waterfront (1954)

Once Upon a Time in the West

Out of the Past

Oedipus the King (1968)

Oh! What a Lovely War (1969)

Our Man in Havana (1959)

Overland Stage (1927)

Overland Telegraph (1929)

Over the Hill to the Poorhouse (1920)