A vehicle stop control system capable of finely and properly determining traveling of a vehicle in a traffic jam to permit or inhibit automatic stop according to the determination result to ensure the effect of fuel economy improvement by automatic stop and avoiding inconveniences caused by frequent execution of automatic stop and restart. The system sets a precondition vehicle speed satisfaction flag to 1 when a vehicle speed becomes not lower than a precondition speed after an internal combustion engine was automatically stopped to permit automatic stop. Further, time after the vehicle speed passed a jam determination speed and until the vehicle speed passes the same again is acquired as passing time. When the passing time is shorter than a predetermined time period, the system determines that the vehicle is traveling in a jam, and resets the flag to 0 to inhibit automatic stop.