A shift control system is mounted on a vehicle that includes a transmission. The transmission includes a multi-gear shifting mechanism. Also, the transmission is configured to shift a speed of rotational power from an engine in response to a shift request and to output the rotational power to a drive wheel side. The shift control system includes a detecting unit and a control unit. The detecting unit detects the shift request. When the detecting unit has detected a multiple-gear skip downshift request as the shift request from a first gear to a second gear, the control unit executes shift control that includes a skip shift from the first gear to a predetermined intermediate-speed gear and a sequential shift from the predetermined intermediate-speed gear to the second gear, the first gear been higher by multiple gears than the predetermined intermediate-speed gear.