The objective of the present invention is to provide a control device for an internal combustion engine with which it is possible to achieve both a control for suppressing abnormal combustion and a catalyst temperature control when abnormal combustion is detected. With the present invention, the catalyst temperature of a catalyst arranged in the exhaust passage of the internal combustion engine is obtained, and abnormal combustion in the combustion chamber of the internal combustion engine is detected. In addition, the present invention is equipped with: a gas control means that controls the amount of intake air flowing into the combustion chamber and the temperature of the exhaust air flowing into the catalyst; a fuel injection amount control means that controls the amount of injected fuel supplied to the combustion chamber; and an abnormal combustion suppression mode selection means that selects one of three modes on the basis of the catalyst temperature when abnormal combustion is detected. In the first mode abnormal combustion is suppressed by increasing the catalyst temperature by means of the gas control means, in the second mode abnormal combustion is suppressed by suppressing an increase in the catalyst temperature by means of the fuel injection amount control means, and in the third mode abnormal combustion is suppressed by means of the gas control means and the fuel injection amount control means.