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The Zeta converter is a DC-DC converter that has a small ripple current and voltage ripple that is widely applied to PFC (power factor correction), photovoltaic generation and so on. However, the characteristics of the open loop response output voltage from the Zeta converter has a considerable overshoot and long settling time. On the other hand, with significant changes at input voltage and load, the output voltage produced by Zeta converter may fluctuate. Therefore, a PID controller based on Fuzzy logic tuning is implemented to regulate the output voltage of Zeta converter. According to simulation results the output voltage with Fuzzy-PID controlled is able to track the desired reference voltage. Compared to PID controller, the output voltage controlled with Fuzzy-PID controller has a smaller voltage deviation and recovery time. At a significant input voltage change the PID controller output response becomes unstable, while the fuzzy-PID controller still produces a good output response.