Mirbt studied theology from 1880 to 1885 in Halle, Erlangen and Göttingen. During his studies in Göttingen, he was a member of the Thuringia Academic Theological Society.Bericht der Thuringia. Akad-Theol. Verbindung an der Georgia Augusta zu Göttingen. Summer-Semester 1907 – Summer-Semester 1909 p.16. In 1888, he became a member of the Theological Faculty of the University of Göttingen with a doctoral dissertation on "The Position of Augustine in the Gregorian Church Dispute". In 1888, he qualified as a Göttingen professor in church history.
