Ernst Constantin Ranke (10 September 1814, Wiehe – 30 July 1888, Marburg an der Lahn) was a German Protestant theologian; since 1850, a professor of church history. He was the brother of historian Leopold von Ranke (1795–1886), theologian Friedrich Heinrich Ranke (1798–1876) and philologist Karl Ferdinand Ranke (1802–1876).
He studied theology in Leipzig, Berlin and Bonn, and later became a pastor in the town of Buchau. From 1850 onward, he was a full professor of theology at Marburg University, where he taught classes in church history and New Testament exegesis. In 1865/1866 he served as university rector.
He was a councillor of the Lutheran consistory with great impact to the issues of the Church of Hesse-Cassel. He wrote poems and published translations of the Bible and books of songs.