Ernst Kähler (1914–1991) was a German Protestant theologian and Church historian.
Kähler studied in Tübingen, Göttingen, Halle and Basel.
He served as assistant at the theological faculty at Halle University during 1942–1951.
From 1952 he was rector at the theological seminary at Naumburg, then in the German Democratic Republic.
Kähler received an honorary doctorate from the theological faculty at Göttingen University in 1957.