Anton Ortmann (19 March 1801 – 21 November 1861) was a Czech-Austrian pharmacist and botanist, known for his investigations of flora native to Bohemia, notably in the environs of Karlovy Vary and Loket.
Ortman was born on 19 March 1801 in Planá near České Budějovice, Bohemia. During his career, he worked as a pharmacist in Karlsbad (now Karlovy Vary) and later Elbogen (now Loket; since 1842). From 1857 to 1861 he served as mayor of Elbogen. He died in Elbogen on 21 November 1861.
Historically, numerous new genera were named to honor him; Ortmannia Opiz, 1834; Ortmannia Rathbun, 1901; Ortmannia de Loriol, 1906; Ortmannia Schrammen, 1924; Ortmannia Chiesa, Parma & Camacho, 1995; Ortmanniana Frierson, 1927; Ortmannicus Fowler, 1911; Ortmannispongia Schrammen, 1936; however, only the last three are still valid names as of 2024.