Fiscal Policies for Paris Climate Strategies - From Principle to Practice provides country-level guidance on the role, and design of, fiscal policies for implementing climate mitigation strategies that countries have submitted for the 2015 Paris Agreement and for addressing vulnerabilities in disaster-prone countries. On the mitigation side, the paper presents a spreadsheet tool for judging the likely impact on emissions, fiscal revenues, local air pollution mortality, and economic welfare impacts of a range of instruments including comprehensive carbon taxes, emissions trading systems, taxes on individual fuels, and incentives for energy efficiency. On the adaptation side, the paper stresses that a holistic strategy, going well beyond physical climate-proofing investment, is needed in vulnerable countries.