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Willem Leo Marie (Leo) Wetzels (born 9 September 1951, Schinnen) is a full professor at the Vrije Universiteit Amsterdam in the Netherlands and Directeur de recherche at Laboratoire de Phonétique et Phonologie (LPP), CNRS/Sorbonne-Nouvelle in Paris. He is Editor-in-Chief of Probus International, the Journal of Latin and Romance Linguistics.
Wetzels has received numerous research grants, most recently a VU University research grant for an AIO-project on Aymara Morphophonology and the NWO internationalization grant which aims at constructing an international cooperation network in the area of Amerindian languages and cultures involving the chair of Amazonian Languages at the VU, the Centre d'Etudes des Langues Indigènes d'Amérique, CNRS, Paris, the Leiden Centre for Amerindian Studies, the Anthropology department of the Universidade Federal do Amazonas, Manaus, Brazil, and the Instituto Nacional de Pesquisas da Amazônia (National Institute for Amazonian Studies), Manaus, Brazil.