Jean Majerus (6 February 1914 in Luxembourg City - 16 June 1983 in Esch-sur-Alzette) was a professional Luxembourgian cyclist from 1936 to 1947. Jean had a younger brother, Jacques Majerus, who was also a successful cyclist. His first great success was in the 1937 Tour de France, where Jean Majerus won the first stage, and remained in the yellow jersey for two days. In the 1938 Tour de France, Jean Majerus repeated this by winning the second stage, and taking the yellow jersey, this time keeping it for four days.
During WWII, when Luxembourg was a part of the German Nazi empire, Majerus raced a lot in the entire German empire. Jean Majerus was good in one-day races; in the all-time list he still can be found around place 583. In the world championship road race-ranking he even can be found around place 164, although his best result was fourth place in the 1937 world road race championship.