A thermal management system for a vehicle includes: a cooling apparatus including a radiator, a first water pump, and a first valve that are connected by a coolant line and recirculating a coolant in the coolant line so as to cool at least one electrical component provided on the coolant line, a first connection line selectively connected to the coolant line through the first valve, a second connection line selectively connected to the first connection line through the second valve, and a heater provided on the second connection line, wherein the first connection line is provided with a condenser included in an air conditioner device, and the heater is provided inside an HVAC module included in the air conditioner device.