Peter Daniel O'Sullivan (22 May 1932 – 23 September 1972) was an Australian rules footballer who played with Essendon and North Melbourne in the Victorian Football League (VFL) during the 1950s.
O'Sullivan, who was a good performer for Ascot Youth Centre in the Essendon District League before joining the VFL, played his football on the wing and as a half-forward flanker.
After making 12 appearances in his debut season with Essendon, O'Sullivan played 19 games in 1953, including a semi final.
Over the next two seasons O'Sullivan found in more difficult to establish a place for himself in the side and in 1956 joined Charlie Gaudion's North Melbourne. He spent three years at North Melbourne before finishing his career in the Victorian Football Association at Brunswick.
At the age of 40, O'Sullivan was killed in a car accident on the Calder Highway, south of Ouyen, on 23 September 1972.