Johannes Sieval
- Born: 29 Oct 1919, Leiden, , Zuid-Holland, Netherlands
- Marriage (1): Catharina Maria Wassenaar on 8 Jun 1942 in Leiden, , Zuid-Holland, Netherlands
- Died: 3 Aug 1996, Leiden, , Zuid-Holland, Netherlands at age 76
Johannes married Catharina Maria Wassenaar, daughter of David Wassenaar and Dina Schroef, on 8 Jun 1942 in Leiden, , Zuid-Holland, Netherlands. (Catharina Maria Wassenaar was born on 24 May 1920 in Leiden, , Zuid-Holland, Netherlands, died on 26 Dec 2003 in Leiderdorp, , Zuid-Holland, Netherlands and was buried on 31 Dec 2003 in Leiden, , Zuid-Holland, Netherlands.)
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