David Clifford Cretney (born 15 January 1954) is a former Manx politician. He was, until March 2014, Minister of Infrastructure in the Isle of Man Government, and had formerly headed the Departments of Community, Culture & Leisure, Trade & Industry, and Tourism & Leisure. He was a Member of the House of Keys for the Manx Labour Party, representing Douglas South from 1985. He has been a member of the upper house, the Legislative Council since 2015. Before going into politics, Cretney was a shop manager (1977–85) and he was also a businessman in the period 1985–2012.