Johann Gebhard Ehrenreich Maass (German: Maaß; February 26, 1766 – December 23, 1823) was a German psychologist.
Maass was born in 1766 in Krottendorf near Halberstadt.
In 1791 he became an extraordinary professor of philosophy, and in 1798 a full professor.
Among his writings on psychology are Versuche: Ãœber die Einbildungskraft (1792; 2nd ed.
1797), Über die Leidenschaften (1805–1807), and Über die Gefühle und Affekte (1811).