Alexander Bittner (16 March 1850, in Friedland – 31 March 1902, in Vienna) was an Austrian paleontologist and geologist. Following graduation from the University of Vienna in 1873, he remained in Vienna as an assistant to Eduard Suess. In 1874-76 he conducted geological research in Italy and Greece, followed by an internship at the Imperial Institute of Geology in Vienna (1877). In 1897 he was appointed chief geologist of the institute.