Koppl is a municipality in the district of Salzburg-Umgebung, in the state of Salzburg, Austria. It lies in the western part of the state, where it borders the urban area of the city of Salzburg.
Its position within Salzburg-Umgebung places it among the municipalities of the district that surrounds the state capital. The municipality's western boundary adjoins the Salzburg urban area, making Koppl one of the communities directly adjacent to the city of Salzburg.