Caspar Riffel (January 19, 1807, Budesheim, Bingen, Germany – December 15, 1856) was a Catholic historian.
Riffel studied under Heinrich Klee at Mainz and Bonn and under Johann Adam Möhler at Tübingen.
After his ordination to the priesthood (18 Dec., 1830) he was named assistant priest at Bingen.
This measure caused intense indignation among the diocesan Catholic clergy, who denounced the Protestant atmosphere of the university.
Riffel retired to Mainz, where in 1851 Bishop von Ketteler appointed him professor of church history in his newly organized ecclesiastical seminary.