Willem (Wim) Betz (22 February 1943 – 8 June 2019) was a Belgian physician. He was a professor emeritus at the Belgian university Vrije Universiteit Brussel (VUB) until November 2007. Betz was a leading skeptic in Flanders and participant in the EU COST B4 Project. He was a founding member and vice-president of the Belgian skeptic organisation SKEPP.
Betz died on 8 June 2019 at the age of 76.