This study explores the impact of financial technology (fintech) on enhancing financial inclusion for unbanked and underbanked populations. It examines the obstacles to accessing financial services and the innovative fintech solutions that address them. Approximately 1.4 billion adults globally remain unbanked, facing challenges such as geographical isolation, socioeconomic status, and gender disparities. Fintech offers a range of digital financial services, including mobile banking, digital payments, peer-to-peer lending, and blockchain solutions, which can enhance financial inclusion by delivering affordable and accessible services to underserved populations. This study also examines financial inclusion in the United States, where millions remain unbanked or underbanked due to cost and limited access to traditional banking services. Through a comprehensive analysis of case studies from countries like Kenya and India, where fintech innovations such as mobile money and Aadhaar-enabled payment systems have significantly increased financial access, the study highlights the transformative impact of fintech on financial inclusion. The study identifies critical challenges in fintech adoption, including regulatory hurdles and digital literacy. It proposes strategies for fostering an inclusive financial ecosystem that leverages technology to promote economic growth and poverty alleviation. By examining these factors, the study concludes that through strategic collaboration and investment in digital infrastructure, fintech can play a pivotal role in achieving universal financial inclusion, contributing to broader economic development and social equity.