Patrick Duncan may refer to: Sir Patrick Duncan (South African politician) (1870–1943), Governor-General of South Africa Patrick Sheane Duncan (born 1947), American writer, film producer and director Paddy Duncan (1894–1949), Irish footballer Patrick Duncan (anti-apartheid activist) (1918–1967) Pat Duncan (baseball) (1893–1960), baseball player Pat Duncan (born 1960), Canadian Liberal politician