Robert Sinclair

• 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

• 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

• 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)

• Bob Sinclar (born 1969), French record producer and DJ
• Bob St. Clair (1931–2015), American football player
• Sinclair (surname)

{{hndis|Sinclair, Robert}}