The invention provides a control apparatus for an engine. The increasing output of the engine can be inhibited during the speed reduction, and at the same time, the EGR gas can be exhausted as soon as possible, and the attenuation in advance of the EGR rate can be realized. An engine(1) includes an injector(25), an ignition plug(29), a supercharger(7), an electronic throttle device(14), and an EGR apparatus. An EGR passage(17) has an inlet(17b) connected to an exhaust passage(17a) downstream of a turbine and an outlet connected to the intake passage upstream from a compressor. A fresh-air introduction passage is arranged to introduce fresh air to a surge tank downstream from the electronic throttle device(14) and a fresh-air control valve(41) is provided to regulate a fresh air amount. When an ECU determines that the engine is under deceleration and under fuel supply, the ECU closes the electronic throttle device(14) to a predetermined opening degree to scavenge EGR gas flowing from the EGR passage and remaining in the intake passage, opens a fresh-air control valve(42) to a predetermined opening degree, and causes the ignition plug(29) to retard an ignition timing.