Franz Ludwig Carl Bohnstedt (27 October 1822, Saint Petersburg – 3 January 1885, Gotha) was a Baltic-German architect, who spent much of his career in Thuringia.
He returned to Saint Petersburg in 1843, and found a position in the studios of Rudolf Zhelyazevich [ru].
In the late 1840s, he was appointed a Court Architect; helping to restore Royal properties on the Kamenny Islands, and at Oranienbaum.
They had five children, including Ernst (1851–1908), a manufacturing director, Alfred (1854–1906), who also became an architect, and Ida (1858–1916), a painter.
This focus on Germany, as well as health considerations, led him to Saxe-Coburg-Gotha, where he and his family settled in 1862, and he worked as an official architect for the city of Gotha.