This paper proposes a principles-based framework to define climate transition finance in context of market developments to date in China and Hong Kong but is also potentially regionally relevant. This approach, in spirit, is about financing technologies and activities that drive lower carbon outcomes than business-as-usual. This paper jumps into the fast-growing global discussion on the topic of climate transition finance with an overview of existing terms and market discussions. The aim of this proposal is to add to the conversation on defining climate transition finance, with insights and views from China and Hong Kong SAR, which are hoped to add to the momentum that leads to greater climate action.