Dunkin is a surname. Notable people with the surname include:
Christopher Dunkin, PC (1812–1881), Canadian editor, lawyer, teacher, judge, and politician
Edwin Dunkin FRS, (1821–1898), British astronomer
Kenneth Dunkin, (born 1966), Democratic member of the Illinois House of Representatives
Robert Dunkin (1761–1831), mentor of the young Humphry Davy
Tony Dunkin (born 1970), American basketball player
William Dunkin (1709–1765), Irish poet