The hydrogen buses market is on a trajectory of rapid expansion, with a projected compound annual growth rate of 29.8% from 2025 to 2035, reaching a market size of USD 17,658.9 million by the end of 2035. This growth is fueled by environmental regulations targeting urban emissions, government incentives supporting zero-emission public transport, and technological advancements in fuel cell stack efficiency. Major transit agencies worldwide are piloting hydrogen bus fleets as part of decarbonization strategies. The market is witnessing a decline in fuel cell system costs, narrowing the price gap with traditional diesel or battery electric buses. Public-private partnerships are crucial for co-funding depot refueling stations and integrating green hydrogen from renewable sources. The industry is moving towards modular, standardized fuel cell units, IoT-based telematics for real-time monitoring, and hybrid drivetrains combining hydrogen fuel cells with battery packs. Green hydrogen certification is becoming a differentiator for sustainability-focused transit authorities. Recent developments include significant contracts for hydrogen buses, operational advancements like Australia's first hydrogen bus rapid transit line, and investments in hydrogen refueling stations. Key players in the market include Ballard Power Systems, Toyota, Solaris, Hyundai, and Van Hool. The sector's future competitiveness lies in technological innovation, strategic partnerships, and adherence to sustainability goals.