Wilhelm Karl Keppler (14 December 1882 – 13 June 1960) was a German businessman and one of Adolf Hitler's early financial backers.

He then served in the army between 1903 and 1904 before attending Königliche Technische Hochschule zu Danzig from 1905 to 1910, where he earned his degree in engineering.

He co-owned Odin Works, a small photographic gelatin factory, and was chairman of the I. G. Farben subsidiary Braunkohle-Benzin AG.

[1] Keppler's business career had given him close ties to the Eastman Kodak Company and other American corporations, with whom he would continue dealing as a Nazi official.

[1] In October 1933, he was a founding member of Hans Frank's Academy for German Law and was named to its präsidium, or executive committee.

Keppler became Secretary of State with special duties in the Foreign Office during World War II, during which he administered SS confiscated industries in Poland and Russia.