Markus Bär Friedenthal (born June 23, 1779, Groß Glogau - December 3/December 8, 1859, Breslau) was a German Jewish banker and scholar.
Although one of the leading bankers at Breslau, he devoted much time to study and to communal affairs.
His special interest lay in the field of religious philosophy and dogma, which he treated rather in an apologetic than in a purely scientific manner.
His works nevertheless revealed great sagacity, and had the merit, coming as they did from a conservative, of opening to the Talmudists the field of modern critical studies.