Johann Michael Rottmayr was an Austrian painter.
Rottmayr was born in Laufen an der Salzach, Bavaria. Along with his Laufen-born contemporary, Hans Adam Weissenkircher, he received his education from Johann Carl Loth in Venice. Just as Weissenkircher had brought the Italian Renaissance to the Southern Alps and the court of the Princes of Eggenberg in Graz, Rottmayr brought it north of the Alps. From 1689 onwards, he worked in Salzburg, and was employed as the general painter of the Prince-Bishop of Salzburg.