Fin4Dev is an unprecedented initiative based on the strategic vision that financial systems stakeholders are not mere intermediaries but that they can be key vectors and catalyzers of sustainable development. Fin4Dev seeks to support both local financial institutions and financial authorities in designing their transition strategies aligned with the 2030 Agenda and the Paris Agreement. Fin4Dev aims at lifting specific barriers and constraints that prevent Financial Systems and Public Development Banks from channeling financial flows towards investments compatible with the SDGs: it will uniquely seek to provide financial actors with support to build their internal strategies and capacities, to identify the risks and opportunities linked to these issues, to push for evolutions in the national regulatory frameworks that bound financial actors’ actions.