Niels William Scharff (1886–1959) was a Danish painter, one of the leading proponents of Cubism in Denmark.
After training as a painter at Copenhagen's Technical School, Scharff attended Kristian Zahrtmann's art school (1907–1909) where he met young talents including Vilhelm Lundstrøm, Jais Nielsen and Olaf Rude. As a student, he travelled to Berlin, Dresden and Paris.
During the First World War, Scharff was involved in Grønningen, a new artists' cooperative with an interest in Cubism. His Cubist tendencies can clearly be seen in his Legende I (1911, Randers Kunstmuseum) and in a series of pictures depicting poultry (1917–1918) and representing harmony between man and nature. His style was inspired by Cubism and the Abstract art movement while many of his subjects were based on his upbringing with his grandparents in the farming community of Tisvilde in the north of Zealand.
In addition to his paintings, he decorated the students' residence Studentergaarden with frescoes (1943–1953), designed tapestries for Christiansborg (1951–1958) and created the curtain for Tivoli's concert hall (1956).