This article presents a new design of active power factor correction (APFC) circuit that can be used in single phase rectifiers. The proposed circuit provides almost a unity input power factor (PF) which contributes significantly in reduction of the total current harmonic distortion (THDI) as it eliminates the third harmonic component effectively from the input current. The most important attribute of this circuit is the small size and numbers of components (one switch, small size (L & C) and a diode), which have been designed to get a unity PF at the AC source side. Therefore, the new circuit is cheaper, smaller size and lighter than other conventional PFC circuits. In addition, the new proposed circuit is a snubberless and uses reasonably low switching frequency which reduces switching losses and increases efficiency. The circuit has been designed and simulated using Lt-spice simulink program.