Vladimir Germanovich Bogoraz (Russian: Влади́мир Ге́рманович Богора́з), who was born Natan Mendelevich Bogoraz (Russian: Ната́н Ме́нделевич Богора́з) and used the literary pseudonym N. A. Tan (Russian: Н. А. Тан) (April 27 [O.S. April 15] 1865 — May 10, 1936), was a Russian revolutionary, writer and anthropologist, especially known for his studies of the Chukchi people in Siberia.