Alleins is a commune in the Bouches-du-Rhône department in the Provence-Alpes-Côte d'Azur region of southern France.

The Aix-Marseille-Provence Metropolis is the métropole, an intercommunal structure, centred on the cities of Marseille and Aix-en-Provence. It is located in the Bouches-du-Rhône, Var and Vaucluse depa