This paper compares debt-for-climate swaps—partial debt relief operations conditional on debtor commitments to undertake climate-related investments—to alternative fiscal support instruments. Because some of the benefits of debt-climate swaps accrue to non-participating creditors, they are generally less efficient forms of support than conditional grants and/or broad debt restructuring (which could be linked to climate adaptation when the latter significantly reduces credit risk). This said, debt-climate swaps could be superior to conditional grants when they can be structured in a way that makes the climate commitment de facto senior to debt service; and they could be superior to comprehensive debt restructuring in narrow settings, when the latter is expected to produce large economic dislocations and the debt-climate swap is expected to materially reduce debt risks (and achieve debt sustainability). Furthermore, debt-climate swaps could be useful to expand fiscal space for climate investment when grants or more comprehensive debt relief are just not on the table. The paper explores policy actions that would benefit both debt-climate swaps and other fo