Arthur Moritz Schoenflies (German: [ˈʃøːnfliːs]; 17 April 1853 – 27 May 1928), sometimes written as Schönflies, was a German mathematician, known for his contributions to the application of group theory to crystallography, and for work in topology.

Schoenflies was born in Landsberg an der Warthe (modern Gorzów, Poland).

He studied under Ernst Kummer and Karl Weierstrass,[1] and was influenced by Felix Klein.

-sphere in Euclidean n-space bounds a topological ball, however embedded.

Schoenflies was a frequent contributor to Klein's Encyclopedia of Mathematical Sciences: In 1898 he wrote on set theory, in 1902 on kinematics, and on projective geometry in 1910.