| Honorific-Prefix: | His Excellency |
| Jan Heemskerk | |
| Order: | Chairman of the Council of Ministers |
| Term Start: | 23 April 1883 |
| Term End: | 20 April 1888 |
| Predecessor: | Theo van Lynden van Sandenburg |
| Successor: | Æneas, Baron Mackay |
| Term Start1: | 27 August 1874 |
| Term End1: | 3 November 1877 |
| Monarch1: | William III |
| Predecessor1: | Gerrit de Vries |
| Successor1: | Jan Kappeyne van de Coppello |
| Birthname: | Jan Heemskerk Abrahamszoon |
| Birth Date: | 30 July 1818 |
| Birth Place: | Amsterdam, Netherlands |
| Death Place: | The Hague, Netherlands |
| Spouse: | Anna Maria |
| Children: | 8, including Theo Heemskerk |
| Occupation: | Lawyer |
Jan Heemskerk Abrahamszoon (pronounced as /nl/; 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.
Jan Heemskerk Abrahamszoon was born on 30 July 1818 in Amsterdam. He was the son of Abraham Heemskerk and Joanna Jacoba Stuart.[1] He was baptized on 27 August 1818 in the Remonstrant Church in Amsterdam.[2]
He studied law and became a lawyer, then a member of the House of Representatives. Originally a liberal politician, he became a conservative in 1866, and remained this in his Premiership.
He was three times Ministers of the Interior (1866–1868; 1874–1877; 1883–1888) and three times temporary chairman of the Council of Ministers, similar to the present-day Prime Minister, (1867–1868; 1874–1877; 1883–1888). He was Minister of State from 1885 to his death.[1]
Heemskerk died on 9 October 1897, at the age of 79, in The Hague.[1]
Heemskerk married his first cousin Anna Maria Heemskerk on 1 October 1846 in Utrecht. They had 5 sons, one of whom died in infancy, and 3 daughters.[1] His son Theo Heemskerk (1852–1932) was Chairman of the Council of Ministers from 1908 to 1913.[3] His son Jan Frederik Heemskerk (1867–1944) was a member of the House of Representatives.[4]
Heemskerk's published works include