The rapid growth of the automotive sector in India, coupled with escalating environmental concerns, underscores the need for sustainable alternatives to fossil fuels. This research paper explores green hydrogen as a transformative solution to decarbonize the Indian auto industry. Green hydrogen, produced using renewable energy sources such as wind and solar, presents a zero-emission alternative to conventional fuels, addressing climate change and energy security challenges. The paper examines the scientific principles of green hydrogen production, storage, and transportation, highlighting its unique advantages over other clean energy alternatives. It evaluates global case studies of hydrogen-powered mobility and analyzes their relevance to India's energy landscape. The economic viability and scalability of hydrogen fuel cells, as well as the infrastructural and technological challenges, are critically assessed. Additionally, the study delves into India's policy framework and government initiatives, identifying gaps and opportunities to accelerate the adoption of hydrogen technologies. Through a comprehensive environmental impact assessment, the paper demonstrates the potential of green hydrogen to reduce carbon emissions in the automotive sector significantly. Finally, a strategic roadmap is proposed, outlining the necessary steps, investments, and collaborations to establish a hydrogen-powered transportation ecosystem in India. This research aims to provide actionable insights for policymakers, industry leaders, and researchers committed to sustainable mobility solutions.