The control system for the hybrid vehicle of the present invention, having an engine for producing a driving force for the vehicle, a motor for producing an assist driving force to assist the output from the engine, and a battery for supplying electric energy to the motor and storing energy regenerated by the motor which acts as a generator, the control system comprises: a voltage detector for detecting a voltage from the battery; a full charge judgement device for judging full charge of the battery based on the voltage detected by the voltage detector; a charging electric power variation detector for detecting variation in a charging electric power for charging the battery; and a full charge judgement prevention device for preventing judging of full charge when the charging electric power variation detector detects the variation in the charging electric power.