Michael von Deinlein (26 October 1800, Hetzles, Upper Franconia – 4 January 1875, Bamberg) was a German Roman Catholic priest, bishop and archbishop.
He studied theology and philosophy in Bamberg and was ordained a priest on 18 November 1824.
He was ordained bishop on 20 November 1853 by Karl-August von Reisach.
In 1856 he became bishop of Augsburg and was awarded the Merit Order of the Bavarian Crown.
He hosted the nineteenth Katholikentag in Bamberg from 31 August to 3 September 1868.