Sir Gervais Squire Chittick Rentoul KC (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." In 1912 he married Christian Muriel Smart (b. 1884); they had one daughter, Sylvia (b. 1916) who married Ferenc Gallo. In 1924 he was Master of the Guild of Freemen of the City of London.