A control system for an internal combustion engine equipped with a supercharger that has a turbine provided in an exhaust passage (6, 7) and a compressor provided in an intake passage (4, 5) to supercharge intake air utilizing the energy of exhaust gas, comprising: a filter provided in the exhaust passage downstream of said turbine to trap particulate matter in exhaust gas; and a regeneration execution unit that is configured to execute filter regeneration control for removing particulate matter deposited in said filter by oxidizing it, wherein the amount of particulate matter deposited in said filter at which said regeneration execution unit terminates the execution of the filter regeneration control after starting the execution of the filter regeneration control is larger when the atmospheric pressure (Pa) around a vehicle equipped with the internal combustion engine is low than when it is high; and the lower the atmospheric pressure (Pa) around the vehicle is, the smaller the amount of particulate matter removed from said filter by executing the filter regeneration control is made; the control system being characterized in that, after starting the execution of the filter regeneration control, said regeneration execution unit is configured to terminate the execution of the filter regeneration control when the amount of particulate matter deposited in said filter (Qpmr) becomes equal to or smaller than a regeneration termination amount (Qpme) determined based on the atmospheric pressure (Pa) around the vehicle, and when the amount of particulate matter deposited in said filter (Qpmr) is smaller than said regeneration termination amount (Qpme) while the filter regeneration control is not being performed by said regeneration execution unit, the control system performs emitted particulate matter increasing control for increasing the quantity of particulate matter emitted from the internal combustion engine. a filter provided in the exhaust passage downstream of said turbine to trap particulate matter in exhaust gas; and a regeneration execution unit that is configured to execute filter regeneration control for removing particulate matter deposited in said filter by oxidizing it, the amount of particulate matter deposited in said filter at which said regeneration execution unit terminates the execution of the filter regeneration control after starting the execution of the filter regeneration control is larger when the atmospheric pressure (Pa) around a vehicle equipped with the internal combustion engine is low than when it is high; and the lower the atmospheric pressure (Pa) around the vehicle is, the smaller the amount of particulate matter removed from said filter by executing the filter regeneration control is made; the control system being characterized in that, after starting the execution of the filter regeneration control, said regeneration execution unit is configured to terminate the execution of the filter regeneration control when the amount of particulate matter deposited in said filter (Qpmr) becomes equal to or smaller than a regeneration termination amount (Qpme) determined based on the atmospheric pressure (Pa) around the vehicle, and when the amount of particulate matter deposited in said filter (Qpmr) is smaller than said regeneration termination amount (Qpme) while the filter regeneration control is not being performed by said regeneration execution unit, the control system performs emitted particulate matter increasing control for increasing the quantity of particulate matter emitted from the internal combustion engine.