Peter Sinclair may refer to:
Politics Peter Sinclair (governor) (born 1934), Rear admiral, first commandant of ADFA, Governor of New South Wales Peter Sinclair Sr. (1819–1906), Canadian Member of Parliament for Queen's County, 1873–1878 Peter Sinclair Jr. (1887–1938), Canadian Member of Parliament for Queen's, 1935–1938
Others Peter Sinclair (broadcaster) (1938–2001), New Zealand television personality Peter J. N. Sinclair (1946–2020), British economist
Peter Sinclair (environmental activist) (born 1953), American climate and environmentalist videographer Peter Sinclair (footballer) (born 1947), Australian football player Pete Sinclair (writer), British radio and television writer