Gregory Thomas Evans, CM OOnt QC (June 13, 1913 – May 23, 2010) was a Canadian judge and the first Integrity Commissioner of Ontario. Born in McAdam, New Brunswick, he received a Bachelor of Arts degree from Saint Joseph's University in 1934 and graduated from Osgoode Hall Law School in 1939. He was called to the Bar of Ontario in 1939 and was created a Queen's Counsel in 1953. A practising lawyer, he was appointed a Justice of the Court of Appeal for Ontario in 1965. From 1976 to 1985, he was the Chief Justice of the .