Sir Gervais Squire Chittick RentoulKC (1 August 1884 – 7 March 1946) was a British Conservative politician.
He was the eldest son of Judge James Alexander Rentoul, M.P. for East Down 1890–1902, and his wife Florence Isabella Young. James Rentoul was something of an eccentric and one contemporary newspaper reported of him that "no man, woman or child wished to see him return to East Down." The family claimed to be descended from King Henry VII.