A power factor correction circuit for the electronic ballast of a fluorescent lamp is provided. The power factor correction circuit is located between a bridge rectifier circuit and A high frequency oscillation circuit of the electronic ballast, and includes a filtering capacitor charge/discharge circuit and a feedback circuit taking input from a filament of the fluorescent lamp. The electronic ballast equipped with the power factor correction circuit achieves a power factor 0.95, a lamp current crest factor 1.7, and a total harmonic distortion 10%.