Jens Ferdinand Willumsen (Copenhagen, 1863 - Cannes, 1958) was a Danish artist who was associated with the movements of Symbolism and Expressionism. Although he was Danish, Willumsen lived almost half of his life in France. Besides painting, Willumsen had interests in sculpture, architecture, ceramics, and photography, and was an accomplished engraver. His sculpture The Great Relief (completed 1928) was included in the 2006 Danish Culture Canon as one of Denmark's cultural masterpieces.
Willumsen had associations with Skagen in the north of Jutland which he first visited in 1906. It was here that he carried out most of the preparatory work on his painting Badende børn på Skagen strand (Children bathing on Skagen beach) which he completed in 1909.