Aaltje Sipkes van der Hoek
- Born: 20 May 1846, Lippenhuizen Opsterland Friesland Netherlands
- Marriage: Heinze Jelles Kooistra 16 May 1874, Smallingerland Friesland Netherlands
- Died: 27 Aug 1923, Smallingerland Friesland Netherlands at age 77
 Another name for Aaltje was Atje.
Aaltje married Heinze Jelles Kooistra, son of Jelle Heinzes Kooistra and Akke Jans de Boer, on 16 May 1874 in Smallingerland Friesland Netherlands. (Heinze Jelles Kooistra was born on 29 Sep 1843 in Smallingerland Friesland Netherlands and died on 23 Jul 1927 in Smallingerland Friesland Netherlands.)
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