Using a method based on secondary data analysis, this paper looks at the important topic of Financial Inclusion in India through the lens of sustainability. The study uses a lot of reliable sources, like government websites, RBI reports, NABARD papers, IBA Bulletins, academic journals, magazines, and bank websites to give a full picture of the present state of financial inclusion in India. It focuses on sustainable financial practises and looks at how inclusion fits in with the social, economic, and environmental aspects of sustainability. One of the most important things about secondary data is that it is useful for giving a history and broad-based view. It is also easy to find and doesn't take a lot of time or money. It does talk about the problems that come with using extra data, like making sure it is relevant, keeping the data safe, and being up to date. The paper carefully puts together data from many different sources to give a full picture of India's long-term financial inclusion situation, highlighting both its successes and areas that need more work. The study's results show that India's financial sector has a lot of possibilities and problems, especially when it comes to sustainability. They also lay the groundwork for future research and policy changes.