Theunis Harmens Veenstra
- Born: 28 Sep 1799, Garijp (Garyp) Tietjerksteradeel Friesland Netherlands
- Christened: 1 Dec 1799, Garijp (Garyp) Tietjerksteradeel Friesland Netherlands
- Marriage: Grietje Gerbens de Vries 29 Nov 1834, Smallingerland Friesland Netherlands
- Died: 17 Jan 1855, Oudega (Aldegea) Smallingerland Friesland Netherlands
 Another name for Theunis was Theunes.
Theunis married Grietje Gerbens de Vries, daughter of Gerben Oedzes de Vries and Aaltje Johannes, on 29 Nov 1834 in Smallingerland Friesland Netherlands. (Grietje Gerbens de Vries was born on 18 Jan 1810 in Oudega (Aldegea) Smallingerland Friesland Netherlands and was christened on 28 Jan 1810 in Oudega (Aldegea) Smallingerland Friesland Netherlands.)
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