Unmanned air vehicles (UAVs) are used successfully in many different fields mainly various military and civilianapplications. Recently electric powered UAVs have become more preferable due to their better accessibility,cost, transportation and silence. However, the batteries used in electric UAVs still do not have enough energydensity for long endurance flights. Due to the difficulty of using piston and gas turbine engines in small-sizedUAVs, hydrogen fuel cells are seen as one of the considerable options to increase endurance and range. In thisstudy, conceptual design of hybrid UAV including fuel cell, solar unit and battery is presented. Small, light andhigh endurance UAV was designed using aerodynamic calculations and minimum power requirement for cruiseflight was determined. 100 W fuel cell produced by Horizon Fuel Cell Technologies and 3S, 5 Ah of battery wereused for main power supplies, moreover solar cells to charge the battery were designed to mount on the surfaceof the wings. Also, a new power management system is designed for switching between the energy sources. Asa result of this work, it is determined that fuel cells and solar units are the significant options which can increasethe endurance of UAV up to 8 times depending on the design, solar flux, hydrogen capacity etc.