August Dieckhoff

August Wilhelm Dieckhoff (5 February 1823 in Göttingen – 12 September 1894 in Rostock) was a German Lutheran theologian known for his studies on the history of evangelical doctrine during the Reformation.

In 1850 he obtained his habilitation from the University of Göttingen, and several years later became an associate professor of systematic and historical theology (1854). In 1860 he was appointed professor of historical theology at the University of Rostock. In 1887 he was named rector of the university. From 1860 to 1864, with Theodor Kliefoth, he edited the Theologische Zeitschrift.

From 1884 onward, he was embroiled in a heated controversy with the "ultra-Lutheran" Missouri Synod that stemmed from a decision that favored the Wisconsin Synod.