The objective of the article is to develop a methodology for a comprehensive assessment of the development of green financing in the Russian Federation, taking into account institutional, market, and performance parameters. Based on a critical analysis of Russian and foreign literature, the regulatory framework, and statistical data, a system of three blocks of indicators is proposed: (1) the institutional and regulatory level of green financing development; (2) financial and market parameters (scale and structure of instruments); (3) environmental and socio-economic results. For each block, private indices were formed, and an integral assessment of the level of development of green financing in the Russian Federation was proposed. The methodology is based on the national taxonomy of sustainable (including green) development projects, data from the Bank of Russia, VEB.RF, Moscow Exchange, and international organizations. It is shown that, despite the presence of a well-established regulatory framework and the growth in the volume of green instruments, the development of green financing in the Russian Federation is hampered by fragmented statistics, the lack of uniform standards for information disclosure, and a limited set of market indicators. The proposed methodological approach improves the comparability of assessments across years and countries and can be used by regulators and market participants for monitoring and planning.