Robert Sinclair may refer to:
Politics Sir Robert Sinclair, 1st Baronet, of Longformacus (died 1678), MP of Scotland for Berwickshire Sir Robert Sinclair, 3rd Baronet, of Longformacus (died 1727), MP of Scotland for Berwickshire Sir Robert Sinclair, 3rd Baronet, of Stevenston (1643–1713), MP of Scotland for Haddingtonshire Robert Sinclair, 1st Baron Sinclair of Cleeve (1893–1979), British businessman and public servant
Sports Rob Sinclair (footballer, born 1974), for Maidstone United Rob Sinclair (footballer, born 1989), English footballer for Forest Green Rovers Bobby Sinclair (1915–1993), Scottish footballer for Falkirk and Darlington
Other Robert Sinclair (bishop) (died 1398), bishop of Orkney and bishop of Dunkeld Robert Sinclair (locomotive engineer) (1817–1898), chief mechanical engineer of the Caledonian Railway Robert B. Sinclair (1905-1970), film and theater director Robert J. Sinclair (1932–2009), American automotive industry executive Sir Robert Sinclair, 9th Baronet (1820–1899)
See also Bob Sinclar (born 1969), French record producer and DJ Bob St. Clair (1931–2015), American football player Sinclair (surname)