Colijn is a Dutch surname. Notable people with the surname include:
Anton Colijn (1894–1945), Dutch amateur mountaineer, son of Hendrikus Caroline Colijn, Canadian mathematician and epidemiologist (1920–2006), Dutch publicist, daughter of Anton Hendrikus Colijn (1869–1944), Dutch politician, twice Prime Minister of the Netherlands Luc Colijn (born 1958), Belgian racing cyclist Peter Colijn (died 1535), Dutch statesman, and the burgomaster of Amsterdam Johannes Colijn (c.1692-1743) Early South African wine maker on farm Hoop op Constansia. See also Colijn de Coter (c. 1440–1445 – c. 1522–1532), an early Netherlandish painter David Colijns (1582 – c. 1665), a Dutch Golden Age painter