For high voltage applications, a novel hybrid solid-state Marx generator (HSSMG) realizing three-phase Fibonacci operations is presented in this paper. Unlike traditional SSMG, the proposed HSSMG with a single inductor is controlled by three-phase clock pulses in order to generate a high voltage with small component count. The key point of the proposed topology is the fusion of a Fibonacci generator and a boost converter controlled by three-phase clock pulses. The proposed HSSMG provides a higher output voltage than the traditional SSMG by boosting the output of the Fibonacci module by the boost module. The characteristics of the proposed HSSMG is clarified through theoretical analysis, computer simulations, and laboratory experiments. A comparative analysis revealed that the proposed HSSMG can reduce the component count by A comparative analysis revealed that the proposed HSSMG can reduce the component count by about half compared to the traditional SSMG when the voltage gain is 6 times compared to the traditional SSMG when the voltage gain is 6 times. The SPICE simulations showed the power efficiency of the proposed HSSMG reaches more than 86% at 5 W when the voltage gain is 6 times. Furthermore, the feasibility of the proposed topology was confirmed by some experiments using a laboratory prototype.