Progg, a contraction of the Swedish word for "progressive music" (progressiv musik) was a left-wing and anti-commercial musical movement in Sweden that had its roots in the late 1960s, and its golden age in the 1970s. It should not be confused with the English expression progressive music or progressive rock. Progg is not a genre. There were progg bands playing progressive rock, but the progg movement encompassed many other genres.

The progg movement was closely connected to similar movements in arts, theatre and design, and to alternative life styles and left wing views. The people playing and listening to this music came to be called proggare (Lit. proggers) in Swedish.