Hieronymus van der Mij (1687–1761) was an 18th-century portrait painter from the Dutch Republic.
He was born in Leiden and was a pupil of Willem van Mieris.[1] He became a teacher and later director of the Leidse Tekenacademie, where his pupils were Pieter Catel, Johannes le Francq van Berkhey, Nicolaas Reyers, Nicolaas Rijnenburg, and Hendrik van Velthoven.[1] He died in Leiden.