Donald Keith "D.K." Duncan, CD, (1940 – September 17, 2020) was a Jamaican dental surgeon and politician. He was a member of the People's National Party (PNP). He was Minister of National Mobilization & Human Resource Development between 1977 to 1980. Duncan was born in St. Ann, Jamaica. He was a member of the Parliament of Jamaica between 1976 to 1983 and again from 2007 to 2016.