Thomas von Westen (13 September 1682 – 9 April 1727) was a Norwegian Lutheran priest and missionary.

He was the son of Arnoldus von Westen (1643–1698) and his second wife, Inger Marie Thomasdatter Meyer.

Von Westen attended Trondheim Cathedral School and was educated for the priesthood at the University of Copenhagen where he took his Artium Baccalaureus degree in 1698.

The group met regularly to establish mutual support and to advance the principals of Pietism (Norwegian: Pietismen).

The school closed after Westen died in 1727; however, it served as a model for the later Seminarium Lapponicum which operated between 1752–1774.