Johann (John) Georg Hagen (March 6, 1847 – September 6, 1930) was an Austrian Jesuit priest and astronomer.

Father Hagen was also the spiritual director of Maria Elizabeth Hesselblad (1870-1957), who was baptized by him on August 15, 1902 and eventually was canonized on June 5, 2016 by Pope Francis.

[1] Johann Georg Hagen was born in Bregenz, Austria on 6 March 1847, the son of a school teacher.

On July 4, 1872, Otto von Bismarck, chancellor of Germany, expelled the Jesuits from the German Empire.

There he began teaching at Sacred Heart College in Prairie du Chien, Wisconsin.