A capsule dispenser for bottling lines includes a motorized wheel with a horizontal axis supports sockets provided with an open end, which follow one another in receiving respective capsules in a capsule loading position and expelling them in a capsule releasing position. Their open ends are directed outward between these positions. A duct supplied with pressurized air has an arched profile about the axis of the wheel and extends externally to the sockets between the capsule loading position and the capsule releasing position. The duct has a tube which, at a lower end, bifurcates into two branches, between which the neck of the bottle is inserted just before the application of the capsule, and is provided with holes directed inwardly to blow air in the direction of the open end of the sockets.