Theodor Fuchs (15 September 1842 in Eperies – 5 October 1925 in Steinach am Brenner) was an Austrian geologist and paleontologist.
He studied geology and paleontology at the University of Vienna as a pupil of Eduard Suess (doctorate 1863).
[2] In 1894 he proposed the Chattian age, a chronostratigraphic stage of the Oligocene epoch.
[3][4] In 1895 he was the first to report on soft sediment deformations known today as "load casts" — at the time, Fuchs used the descriptive term Fließwülste (flow crests).
[5] He was a proponent of Esperanto; in 1912 he translated the introductory chapter of Eduard Suess's Das Antlitz der Erde ("The face of the Earth") as La vizaĝo de la tero.