Louis De Ridder (9 June 1902 – 5 May 1981) was a Belgian winter sports athlete who competed in the 1920s and 1930s. Competing in two Winter Olympics in three different sports, he earned his best finish of fifth at Garmisch-Partenkirchen in 1936 in the four-man bobsleigh event. De Ridder also competed at the 1924 Winter Olympics in Chamonix. As a speed skater, he finished 19th in both the 500 m and 1500 m events. He was part of the Belgian ice hockey team that finished tied for seventh with Switzerland at the same games.