Otto Wilhelm Hermann Abich (11 December 1806 – 1 July 1886) was a German mineralogist and geologist who was among the first to conduct scientific studies in the Caucasus region and has been called the Father of Caucasian Geology.

Abich was the son of mining officer Heinrich Carl Wilhelm and his wife Johanna Wilhemine, daughter of the chemist Martin Klaproth.

Following a recommendation by von Buch, he made special studies of fumaroles, of the mineral deposits around volcanic vents, and of the structure of volcanoes, travelling to Vesuvius, Aetna, Stromboli and Lipari around 1833-34.

[3] Residing for some time at Tiflis, he investigated the geology of the Armenian Highland (this term was introduced by Abich)[4] and Caucasus.

He received the Constantine gold medal of the Imperial Russian Geographical Society for this, and a third volume was published posthumously, edited by Eduard Suess, with a biography.