Catharina Maria Wassenaar
- Born: 24 May 1920, Leiden, , Zuid-Holland, Netherlands
- Marriage (1): Johannes Sieval on 8 Jun 1942 in Leiden, , Zuid-Holland, Netherlands
- Died: 26 Dec 2003, Leiderdorp, , Zuid-Holland, Netherlands at age 83
- Buried: 31 Dec 2003, Leiden, , Zuid-Holland, Netherlands
 Another name for Catharina was Tine.
Catharina married Johannes Sieval, son of Petrus Sieval and Johanna Taverne, on 8 Jun 1942 in Leiden, , Zuid-Holland, Netherlands. (Johannes Sieval was born on 29 Oct 1919 in Leiden, , Zuid-Holland, Netherlands and died on 3 Aug 1996 in Leiden, , Zuid-Holland, Netherlands.)
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