An exhaust gas turbocharger for an internal combustion engine consists essentially of a turbine and a centrifugal compressor, which are both arranged on a common shaft. A vaned diffuser adjoins the compressor impeller driven by the turbine. An auxiliary air drive, which is fed from an external compressed air source, is provided in the compressor part. The auxiliary air drive has a plurality of ejectors by means of which the auxiliary air can be introduced into the region of the diffuser inlet, preferably in the flow direction.
