This is the final report of the UN Joint Programme ‘Leave No One Behind (LNB)’, providing a summary of its main achievements during the first period of implementation: June 1^st 2017 – July 31^st 2021. Financed by the Swiss Agency for Development and Cooperation (SDC), the programme was implemented by four UN Agencies, UNDP, UNICEF, UNFPA, and UN Women, under the management of UNDP.