A hybrid vehicle control system, which is applied to a hybrid vehicle including an engine, an electric motor and a clutch configured to switch between a transmission of torque between the engine and the electric motor, and a non-transmission of the torque, wherein the hybrid vehicle control system comprises: a traveling mode determining means for determining whether or not to switch a traveling mode of the hybrid vehicle from a first traveling mode in which the clutch is set to a disengaged state and the hybrid vehicle travels by using torque of the electric motor without using torque of the engine, to a second traveling mode in which the clutch is set to an engaged state and the hybrid vehicle travels by using at least the torque of the engine; an engine start controlling means for performing an engine start control for an engine start by applying an engagement pressure to the clutch in accordance with a crank stop position before the engine start control so as to change the clutch from the disengaged state to the engaged state, and by cranking the engine by the motor, when the traveling mode determining means determines to switch the traveling mode of the hybrid vehicle from the first traveling mode to the second traveling mode; a predicted start time calculating means for calculating a predicted start time from a start of the engine start control to an end of the engine start; an actual start time obtaining means for obtaining an actual start time from the start of the engine start control to an actual end of the engine start; and an engagement pressure correcting means for correcting a map in which the engagement pressure is associated with the crank stop position so as to decrease the engagement pressure which is applied to the clutch at the time of performing the engine start control next time, when the actual start time obtained by the actual start time obtaining means is shorter than the predicted start time predicted by the predicted start time calculating means, the predicted start time calculating means is configured to calculate the predicted start time based on the crank stop position during an engine stop before the engine start control, and the predicted start time calculating means is configured to sum up loss torques of all cylinders of the engine, which are required to start the engine, and configured to, at the crank stop position during the engine stop where a total value of the loss torques is large, calculate the predicted start time longer than at the crank stop position during the engine stop where the total value of the loss torques is small. a traveling mode determining means for determining whether or not to switch a traveling mode of the hybrid vehicle from a first traveling mode in which the clutch is set to a disengaged state and the hybrid vehicle travels by using torque of the electric motor without using torque of the engine, to a second traveling mode in which the clutch is set to an engaged state and the hybrid vehicle travels by using at least the torque of the engine; an engine start controlling means for performing an engine start control for an engine start by applying an engagement pressure to the clutch in accordance with a crank stop position before the engine start control so as to change the clutch from the disengaged state to the engaged state, and by cranking the engine by the motor, when the traveling mode determining means determines to switch the traveling mode of the hybrid vehicle from the first traveling mode to the second traveling mode; a predicted start time calculating means for calculating a predicted start time from a start of the engine start control to an end of the engine start; an actual start time obtaining means for obtaining an actual start time from the start of the engine start control to an actual end of the engine start; and an engagement pressure correcting means for correcting a map in which the engagement pressure is associated with the crank stop position so as to decrease the engagement pressure which is applied to the clutch at the time of performing the engine start control next time, when the actual start time obtained by the actual start time obtaining means is shorter than the predicted start time predicted by the predicted start time calculating means, the predicted start time calculating means is configured to calculate the predicted start time based on the crank stop position during an engine stop before the engine start control, and the predicted start time calculating means is configured to sum up loss torques of all cylinders of the engine, which are required to start the engine, and configured to, at the crank stop position during the engine stop where a total value of the loss torques is large, calculate the predicted start time longer than at the crank stop position during the engine stop where the total value of the loss torques is small.