Peter Spaak (1696-1769) was a Swedish Customs Chief Inspector in Uddevalla, and a Protestant reformer. He was the founder of the society of Pietists based in Uddevalla, part of which was later integrated into the Church of Sweden.
Peter Spaak was born 1696 in Uddevalla, Bohuslän, Sweden. His father Elias Jonæ Spaak served as the local Postmaster and Deputy Customs Chief Inspector, and his maternal grandfather was the Chief Judge Johan Larsson Crantzberg. Peter Spaak was married twice. The first time was to Clara Charlotta Esberg, the sister of Zacharias Esberg the Younger, the Vicar of Uddevalla, and niece of Bishop Jacob Berzelius of Gothenburg. His second marriage was to Ingrid Maria Bagge, daughter of Eva Christina Rahde Palmencrona, and great granddaughter of Nils Fredriksson Bagge, Mayor of Marstrand.
Professionally, Spaak served as Chief Inspector of the Customs service, and Postmaster in Uddevalla.