Jan Pieterszoon Beelthouwer () was a Dutch Collegiant controversialist of unorthodox beliefs from Enkhuizen. He propagated Socinian views.Philip Knijff, Bibliographia Sociniana: a bibliographical reference tool for the study of Dutch Socinianism and Antitrinitarianism (2004), p. 23; Google Books.
From around 1644 he had public debates with Isaac Montalto, Jacob Judah Leon and Menasseh ben Israel, Sephardic Jews of Amsterdam.Miriam Bodian, Hebrews of the Portuguese nation: conversos and community in early modern Amsterdam (1999), p. 70; Google Books. He was regarded as a heretic in Enkhuizen from 1656. He wrote against the conservative Mennonite apothecary Lambert Bidloo.GAMEO page
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External links NNBW page Jan Pieterszoon Beelthouwer (ca.1603-ca.1669) en de Joden