Petrus Opmeer (1526–1594) was a Dutch Catholic historian and controversialist.
According to his biographer Valerius Andreas, Opmeer was a friend of "painters, sculptors and architects", including Maarten van Heemskerck, Pieter Aertsen, Willem Danielsz van Tetrode, Frans Floris, Antonis Mor and Philip Galle.