Jan Reehorst (born 21 March 1923 in Rotterdam) is a former Dutch politician. He is a member of the Labour Party. From 1953 until 1973 he was a member of the municipal council, and from 1967 to 1973 also an alderman of Rotterdam. Between 1956 and 1967 he was a member of the House of Representatives. In 1973 he became mayor of Velsen and from 1977 till 1984 he was mayor of Haarlem.