Henry St Clair or Sinclair may refer to:
Henry I St Clair of Herdmanston 12th century Scottish noble Henry St Clair, 7th Baron of Roslin 13th-14th Scottish baron Henry St. Clair (American politician), politician who represented Macon County, Alabama in 1872 Henry I Sinclair, Earl of Orkney Henry II Sinclair, Earl of Orkney Henry Sinclair, 4th Lord Sinclair Henry Sinclair, 6th Lord Sinclair Henry Sinclair, 7th Lord Sinclair
See also Henry Sinclair (disambiguation)