Nels Nelsen (3 June 1894 – 3 June 1943), born Nils Johan Nilsen and sometimes incorrectly referred to as Nels Nelson, was a Norwegian-born Canadian ski jumper and later ski jumping organizer. He was among the world's best ski jumpers during the 1920s, and held the world record of 73 meters from 1925 to 1930. Born in Salangen, he moved with his family to Revelstoke, British Columbia, in 1913. He quickly became the town's best ski jumper, making his debut in the town's Big Hill in 1916.