Gustav III's Pavilion (Swedish: Gustav III:s paviljong) is a royal pavilion at the Haga Park, 2 km north of Stockholm. As a highlight in Swedish art history, the Pavilion is a fine example of the European neoclassicism of the late 18th century in Northern Europe. Beside the Pavilion lie the "Sultan's Copper Tents", buildings designed to resemble big tents.

The pavilion was built in 1787 by the architect Olof Tempelman with detailed instructions from King Gustav III who was highly personally involved in the project, producing some basic designs himself and suggesting changes once the work was under way. These changes included extending both wings by the span of two windows.