Gilbert Desmet (born 2 February 1931 in Roeselare), nicknamed Smetje van Lichtervelde, is a former Belgian cyclist who was professional from 1952 to 1967. In the 1956 Tour de France, he wore the yellow jersey for 2 days, and in the 1963 Tour de France he wore it for 9 days. Desmet won 101 professional races, including Paris–Tours, La Flèche Wallonne and Four Days of Dunkirk. His best result in the Tour de France was his 4th place in 1962. He finished second in the 1959 Paris–Roubaix.

Throughout his career, he was often confused with Gilbert De Smet, another Belgian cyclist with a similar name.