Douglas John "Doug" Slack (born 5 April 1941) is a former Australian politician. He was the National Party member for Burnett in the Legislative Assembly of Queensland from 1986 to 2001.Slack was born in Gayndah, Queensland, and was a farmer and businessman before entering politics. He served on the Opposition front bench from 1990 to 1995, holding the portfolios of Family Servinces and Aboriginal and Islander Affairs and Treasury (1990–1992) and Environment and Heritage (1992–1996).