A composite electronic component composed of a composite body including a capacitor and an electrostatic discharge (ESD) protection device coupled to each other. The capacitor includes a ceramic body in which a plurality of dielectric layers and internal electrodes are stacked with a respective dielectric layer therebetween. The ESD protection device includes first and second electrodes disposed on the ceramic body, a discharging part disposed between the first and second electrodes, and a protective layer disposed on the first and second electrodes and the discharging part. An input terminal disposed on a first end surface of the composite body and is connected to internal electrodes and the first and second electrodes. A ground terminal formed on a second end surface of the composite body and is connected to internal electrodes and the first and second electrodes.