Johann Georg Platzer (1704–1761) was a prolific Austrian Rococo painter and drawer (artist).

Platzer was born in Eppan in the County of Tyrol, and came from a family of painters.

He painted primarily historical and mythical scenes.

The Joanneum Alte Galerie in Graz houses the largest collection of Platzer's work under a single roof.

Platzer worked with his uncle as a court painter in Passau.