A clutch control system for a vehicle having an engine, a vehicle wheel, a clutch disposed in a power transmission path from the engine to the vehicle wheel and a transmission disposed in the power transmission path, the clutch having a driving side portion and a driven side portion disposed respectively at an engine side on the power transmission path and a vehicle wheel side on the power transmission path, the vehicle including a clutch actuator that controls engagement and disengagement of the driving side portion and the driven side portion to each other, the transmission being arranged to enable selection among a plurality of gear positions including a forward gear position at which a driving force of the engine is converted to a rotational force in a forward movement direction of the vehicle wheel, and a reverse gear position at which the driving force of the engine is converted to a rotational force in a reverse movement direction of the vehicle wheel, the clutch control system for the vehicle comprising: a first rotational speed detecting unit configured to detect a driving side rotational speed corresponding to a rotational speed of the driving side portion of the clutch; a second rotational speed detecting unit (16, 50) configured to detect a driven side rotational speed corresponding to a rotational speed of the driven side portion of the clutch; and a half-clutch control unit (10, S5, S33, S34, S44, S45, S53 to S55) programmed to perform half-clutch control of the clutch actuator to execute a first half-clutch control on the clutch actuator when a current gear position of the transmission and a rotational direction of the driven side portion of the clutch are in a matched state, and characterized in that the half-clutch control unit (10, S5, S33, S34, S44, S45, S53 to S55) is programmed to perform half-clutch control of the clutch actuator to execute a second half-clutch control, differing from the first half-clutch control, on the clutch actuator, when the current gear position and the rotational direction of the driven side portion of the clutch are not in the matched state, and the clutch control system further comprises a half-clutch transition control unit (10, S4, S11 to S13) programmed to perform a transition to the half-clutch control of the clutch actuator by the half-clutch control unit (10, S5, S33, S34, S44, S45, S53 to S55) when both the clutch is in a disengaged state so that the driving and driven side portions are disengaged from each other, and at least one of the following conditions is met: a first condition that the driven side rotational speed is higher than the driving side rotational speed, and a second condition that the driven side rotational speed is not less than a predetermined value. a first rotational speed detecting unit configured to detect a driving side rotational speed corresponding to a rotational speed of the driving side portion of the clutch; a second rotational speed detecting unit (16, 50) configured to detect a driven side rotational speed corresponding to a rotational speed of the driven side portion of the clutch; and a half-clutch control unit (10, S5, S33, S34, S44, S45, S53 to S55) programmed to perform half-clutch control of the clutch actuator to execute a first half-clutch control on the clutch actuator when a current gear position of the transmission and a rotational direction of the driven side portion of the clutch are in a matched state, and the clutch is in a disengaged state so that the driving and driven side portions are disengaged from each other, and at least one of the following conditions is met: a first condition that the driven side rotational speed is higher than the driving side rotational speed, and a second condition that the driven side rotational speed is not less than a predetermined value. a first condition that the driven side rotational speed is higher than the driving side rotational speed, and a second condition that the driven side rotational speed is not less than a predetermined value.