Ludwig Diestel (September 28, 1825 – May 15, 1879) was a German Protestant theologian born in Königsberg.
He studied at several universities and in 1851 became a lecturer at the University of Bonn. In 1858 at Bonn he became an associate professor of theology. Later on, he served as a professor at the Universities of Greifswald (1862), Jena (1867) and Tübingen (1872).
Diestel was known for his liberal-minded theological views. He specialized in Old Testamentexegesis and was the author the highly acclaimed "Geschichte des Alten Testamentes in der christlichen Kirche" (History of the Old Testament in the Christian Church), (1868). Other noted works by Diestel include:
Der Segen Jakob's in Genesis, xlix historisch erläutert. (Jacob's Blessing in Genesis, historically explained); CA Schwetschke & Son, Brunswick, 1853
Die Sintflut und die Flutsagen des Alterthums (The deluge and flood legends of ancient times); C. Habel, 1871