Erasmus Fröhlich (2 October 1700 – 7 July 1758) was an Austrian Jesuit mathematics teacher and numismatist.
As a teacher at the Theresianum, he influenced a number of studies in the region in history, mathematics, and astronomy.
In 1744 he wrote on coinage related to the time of Seleucus I Nicator Annales compendiarii regum et rerum Syriae (1744).
This work included some historic and theological views which were disputed by Leipzig scholar Gottlieb Wernsdorf.
His work attracted the attention of Empress Maria Theresia who appointed him teacher of history, archaeology and Greek at the Theresianum.