A composite electronic component includes a capacitor including a capacitor body including a dielectric layer and first and second internal electrodes alternately stacked with the dielectric layer interposed therebetween, and first and second electrodes disposed on the capacitor body, and a varistor including a varistor body including ZnO and third and fourth electrodes disposed on the varistor body, wherein the first electrode is electrically connected to the third electrode and the second electrode is electrically connected to the fourth electrode.