Golovinomyces brunneopunctatus is a species of powdery mildew in the family Erysiphaceae. It is found in North America and Europe, where it affects monkeyflowers (Erythranthe, Diplacus and Mimulus sensu lato).
The fungus forms thin, sometimes greyish, patches on both leaf sides of its host. Golovinomyces brunneopunctatus, like most Erysiphaceae, is highly host-specific and infects only three genera. There is another powdery mildew species found on Diplacus in western North America that represents an unknown Phyllactinia sect. Basiphyllactinia species.
The fungus was formally described in 1984 by Uwe Braun. It was transferred to the genus Golovinomyces by V.P. Heluta in 1988.