Jan Simons Heemskerk
- Born: 1737, Sassenheim, Zuid-Holland
- Christened: 16 Feb 1737, Sassenheim, Zuid-Holland
- Marriage (1): Niesje Leens Wassenaar on 22 Feb 1772 in Noordwijk, Zuid-Holland
- Died: 1818, Noordwijk, Zuid-Holland at age 81
Jan married Niesje Leens Wassenaar, daughter of Leendert Dircx Wassenaar and Aaltje van der Hulst, on 22 Feb 1772 in Noordwijk, Zuid-Holland. (Niesje Leens Wassenaar was christened on 7 Aug 1743 in Noordwijk, Zuid-Holland and died on 12 Oct 1812 in Noordwijk, Zuid-Holland.)
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