Green finance is increasingly essential for sustainable development in emerging markets, enabling transitions to low-carbon and climate-resilient economies. Green finance enables investment in climate resilience, green infrastructure, and renewable energy. Adoption is still hampered; however, by law and regulation, barriers exist in poor institutions, poor investor protection, and limited access to structured financial products. Ineffective green finance systems remain in most Global South nations despite international efforts like the Paris Agreement and the UN SDGs. This research employs a doctrinal methodology to examine legal regimes in India, Brazil, and South Africa using UN Environment Programme (UNEP), World Bank, and Global Green Finance Index sources. It identified deep-seated legal loopholes, weak enforcement, and loose ESG requirements and weighed rigorous policy innovations like tax credits and green bond regulations. The article demands radical reforms in the law and standardised ESG reporting to drive green finance across emerging markets.