Ian Murray McLachlan AO (born 2 October 1936) is a former Australian politician who served as a member of the House of Representatives from 1990 to 1998, representing the Liberal Party. He was Minister for Defence in the Howard Government from 1996 to 1998. Before entering politics, he served as president of the National Farmers Federation from 1984 to 1988. He played first-class cricket as a youth.