The least developed countries (LDCs) are the furthest from achieving the Sustainable Development Goals (SDGs). They are also likely to be hit the hardest by the COVID-19 crisis and badly need the additional private finance that blended finance can unlock. Yet evidence shows that too little private finance is mobilised for investment in LDCs. How can this be fixed? The Blended Finance in the Least Developed Countries 2020 report is the third edition and second joint UNCDF-OECD report. It builds on UNCDF research and transactional experience, OECD data and analysis on private finance mobilized by official development finance, and a series consultations with and contributions by blended finance experts, LDC governments, UN missions, donors, civil society and research institutions. The report provides an update on the deployment of blended finance in LDCs. It also analyses its potential role in helping those countries recover from the COVID-19 crisis, and provides an Action Agenda for unlocking capital for the achievement of the SDGs in LDCs, as called for in the 2030 Agenda for Sustainable Development and the Addis Ababa Action Agenda.