Emil Gabriel Warburg (German pronunciation: [ˈeːmiːl ˈvaːɐ̯bʊʁk]; 9 March 1846 – 28 July 1931) was a German physicist who during his career was professor of physics at the Universities of Strassburg, Freiburg and Berlin. He was president of the Deutsche Physikalische Gesellschaft 1899–1905. His name is notably associated with the Warburg element of electrochemistry. He was a member of the Warburg family, and the father of Otto Heinrich Warburg (Nobel Prize in Physiology, 1931). He was a friend of Albert Einstein.