Louis Trousselier (French pronunciation: [lwi tʁu.sɛlje]; 1881 – 24 April 1939) was a French racing cyclist who won the 1905 Tour de France. His other major wins were Paris–Roubaix, also in 1905, and the 1908 Bordeaux–Paris. He came third in the 1906 Tour de France and won 13 stages of the Tour de France over his career. He also competed in the men's 25 kilometres event at the 1900 Summer Olympics and won a bronze medal in the Men's points race.