Jan Heemskerk, Dutch lawyer and politician, Prime Minister of the Netherlands (b. 1818)
Jan Heemskerk Abrahamszoon (Dutch pronunciation: [jɑn ˈɦeːmskɛr(ə)k ˈaːbraːɦɑmˌsoːn]; 30 July 1818 – 9 October 1897) was a Dutch politician who served as Chairman of the Council of Ministers from 1874 to 1877, and again from 1883 to 1888. His son, Theo Heemskerk also served as Chairman of the Council of Ministers.