Marsatac is a festival of electronic music held at the end of September each year, in Marseille, France.

Since 2009, the festival has had trouble finding a lasting location, and the City of Marseilles has often been criticized for not defending this popular event.

Since its creation, the festival took place in many different locations, on the Frioul archipelago, at Dock des Suds and on the J4, at .

Since 2009 the J4 has been unavailable due to the building of the MUCEM, therefore the festival took place in Dock des Suds, and then at La Friche, where it is still held for the moment.

In Nîmes, the festival occurs in the recent cultural building Paloma.