Gustaaf Van Slembrouck (25 March 1902, Ostend – 7 July 1968, Ostend) was a Belgian professional cyclist from 1926 to 1934, nicknamed 'Den Staf'. He won 4 Tour de France stages, and wore the yellow jersey for 6 days in 1926. He finished in second place in the 1926 Paris–Roubaix.