20th-century Belgian educators

Georges Cuisenaire (1891–1975), also known as Emile-Georges Cuisenaire, was a Belgian teacher who invented Cuisenaire rods, a mathematics teaching aid.

Marie Haps (1879–1939) was a Luxembourg-born Belgian educationalist, the founder of what subsequently became the Institut Libre Marie Haps (now part of the Haute École Léonard de Vinci) and the Marie Haps Faculty of Translation and Interpreting (Saint-Louis University, Brussels).

Jean-Ovide Decroly (Ronse, 23 July 1871 – Uccle, 10 September 1932) was a Belgian teacher and psychologist.
He studied medicine at the University of Ghent, with half a year at the University of Berlin where he studied the action of toxins and antitoxins on general nutrition in 1898. He later worked with (mentally) handicapped children at the neurological clinic in Brussels.
Decroly founded The Hermitage School in 1907. He was a freemason, and a member of the lodge Les Amis Philanthropes of the Grand Orient of Belgium in Brussels. Nowadays the "Ecole Decroly" (based in Uccle, Brussels, a school reaching from kindergarten to baccalaureate) is following his pedagogical approach.