Using policy cycle model as a heuristic, this article studies Indian, Brazilian, and South African engagement with Nationally Appropriate Mitigation Actions (NAMAs) by (a) comparing NAMA policy process and (b) identifying factors driving or limiting the frameworks domestic application. India largely remained uninterested in NAMAs, Brazil aligned its domestic climate policy and NAMAs, while South Africa had a more nuanced engagement when formulating NAMAs. Four factors influenced these countries NAMA engagements: the level and necessity of international support, the availability of domestic policy provisions to tackle climate change, the domestic institutional capacity to coordinate interministerial functioning, and the role of individuals in the institutional apparatus. As an international climate policy framework, studying NAMA engagement provides learnings for nationally determined contributions under the Paris Agreement for designing the instrument, ensuring clarity on support provisions for ratcheting up ambitions, and enhancing institutional capacity, to expedite transition from policy formulation to implementation and beyond.