August Johann Gottfried Bielenstein

August Johann Gottfried Bielenstein (; – ) was a Baltic German linguist, folklorist, ethnographer, and theologian.

Bielenstein was born in Mitau (Jelgava), where he also died. His father was a Lutheran curate and teacher named Johann Gottfried Bielenstein. He spent his childhood in Jaunauce parish. Later he traveled to Germany and studied in gymnasium in Saxony. He studied at the University of Halle (in Prussian Saxony) like numerous prominent pastors in the Baltic region, and received a doctorate in theology from the Imperial University of Dorpat in 1850. He was granted an honorary doctorate from the University of Königsberg in 1883. In 1893, he became honorary member of Riga Latvian society. Two of his children became pastors. One of his sons was architect Bernhard Bielenstein. His daughter was Martha Beilenstein who created the Atlas of the Ethnological Geography of Modern and Prehistoric Latvia (Atlas der ethnologischen Geographie des heutigen und des praehistorischen Lettenlandes). Lettisches wörterbuch ... (H. Brutzer & co., 1972) with Carl Christian Ulmann, Georg Neiken, and Gustav S. Brasche Ein glückliches Leben: Selbstbiographie Lettische Grammatik

Building of former Dobele German pastorat where Bielenstein lived from 1867 until 1905.