Sir John Rolleston Lort-Williams (14 September 1881 – 9 June 1966) was a Judge and MP for Rotherhithe between the general elections of 1918 and 1923. Lort-Williams was born in Walsall, the only son of Charles William Williams, a local solicitor. He was educated at Merchant Taylors School and the University of London. In 1902 he adopted the surname Lort-Williams. Two years later he was called to the bar at Lincoln's Inn. He stood for election for the Conservative Party at the Pembrokeshire during the 1906 United Kingdom general election and the 1908 Pembrokeshire by-election, but was unsuccessful in both attempts, first to John Wynford Philipps and then to Walter Roch.