Benedict Friedlaender (8 July 1866 – 21 June 1908; first name occasionally spelled Benedikt) was a German Jewish sexologist, sociologist, economist, volcanologist, and physicist. Friedlaender was born in Berlin as the son of Carl Friedlaender (1817–1876), a professor of economics. His grandfather was Nathan Friedlaender (died 1830), a Berlin physician and university lecturer. Among his siblings was Immanuel Friedlaender (1871–1948), a distinguished volcanologist. He studied mathematics, physics, botany, and physiology in Berlin, earning a Ph.D. in zoology in 1888.