Michael Richard "Mitch" Williams (born 27 June 1953) is a farmer and former deputy leader of the South Australian Division of the Liberal Party of Australia. He resigned from the Liberals and was elected to the safe Liberal seat of MacKillop in the state's south east at the 1997 election as an independent, but he re-joined the Liberals in 1999. He retained the seat as a Liberal in 2002 and represented it until his retirement in 2018.