This chapter explores the strategic transition of the Gulf Cooperation Council (GCC) nations—Oman, Bahrain, Saudi Arabia, Kuwait, Qatar, and the United Arab Emirates—from economies that depend on fossil fuels to those prioritizing renewable energy and sustainable finance. It highlights key policy measures that support renewable energy, enhanced energy efficiency, and sustainable financial systems, all vital for addressing climate change and attaining long-term environmental sustainability. To foster economic diversification while encouraging environmental stewardship, GCC countries are directing investments toward green finance instruments such as green bonds and sustainability-linked loans. The chapter examines the increasing reliance on renewable energy sources like solar and wind to enhance energy security and promote job creation in the green energy sector. Key initiatives, such as solar parks and carbon capture projects, are underscored as essential elements of this shift. Furthermore, the analysis explores the challenges faced during this green transition, including technological limitations, regulatory hurdles, and societal barriers. Despite these difficulties, it highlights the importance of international collaboration, innovation, and forward-thinking policymaking in positioning the GCC as leaders in global sustainability efforts. The discussion also stresses the role of green finance in supporting this change, suggesting a promising future for sustainable development in the region.