Pieter Reins Theunissen
- Born: 11 May 1804, Sumar (Suameer) Tietjerksteradeel Friesland Netherlands
- Marriage: (1): Antje Johannes Iedema 5 May 1830, Bergum (Burgum) Tietjerksteradeel Friesland Netherlands
- Marriage: (2): Berber Bruins Elsinga 30 Nov 1835, Tietjerksteradeel Friesland Netherlands
- Died: 13 Feb 1859, Nijega Smallingerland Friesland Netherlands at age 54
Pieter married Antje Johannes Iedema, daughter of Johannes Corenlis Iedema and Saakje Wiebes Bander, on 5 May 1830 in Bergum (Burgum) Tietjerksteradeel Friesland Netherlands. (Antje Johannes Iedema was born on 4 May 1804 in Eastermar (Oostermeer) Tietjerksteradeel Friesland Netherlands and died on 7 Dec 1830 in Sumar (Suameer) Tietjerksteradeel Friesland Netherlands.)
Pieter next married Berber Bruins Elsinga, daughter of Bruin Lammerts Elsinga and Gertje Roelofs van der Woude, on 30 Nov 1835 in Tietjerksteradeel Friesland Netherlands. (Berber Bruins Elsinga was born on 2 Jul 1798 in Warten (Wartena) Idaarderadiel Friesland Netherlands and died on 31 Mar 1876 in Rottevalle Smallingerland Friesland Netherlands.)
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