David Bruce Cowan, AM (15 January 1926—7 April 2011) was an Australian politician and Minister of the Crown in the cabinets of Tom Lewis and Sir Eric Willis. He was a member of the New South Wales Legislative Assembly for 14 years from 6 November 1965 until his resignation on 29 August 1980 and then for 13 years in the Australian House of Representatives for Lyne for the Country Party of Australia and its successors, the National Country and then National Parties.