Sir Thomas John Mellis Napier KCMG KStJ QC (24 October 1882 – 22 March 1976) was an Australian judge and academic administrator. He was a judge of the Supreme Court of South Australia between 28 February 1924 and 28 February 1967, Chief Justice of South Australia from 25 February 1942 until 28 February 1967 and Chancellor of the University of Adelaide.