Ernst Melzer (September 21, 1835 – February 1, 1899) was a German educator and philosopher born in the Silesian village of Leifersdorf.
He studied philosophy and theology at the University of Bonn, earning his doctorate in 1860.
Initially a prominent supporter of Güntherianism; in the 1870s he became involved with the German Old Catholic movement.
He was the author of a biographical work on theologian Johann Baptista Baltzer called "Johannes Baptista Baltzers Leben, Wirken und wissenschaftliche Bedeutung" (1877).
Other significant publications by Melzer include: