Johann Friedrich Flatt (20 February 1759 – 24 November 1821) was a German Protestant theologian and philosopher.
He studied philosophy and theology in Tübingen, afterwards continuing his education in Göttingen.
[1] In 1798 he succeeded Gottlob Christian Storr (1746–1805) as a full professor of theology at Tübingen.
[2] He was a disciple of Gottlob Christian Storr, and like his mentor, a representative of the so-called Ältere Tübinger Schule (conservative Tübingen school of theologians) of Biblical Supranaturalism.
He is remembered as a defender of Christian moral theology, and for his critical lectures in regard to Kantian philosophy.