The Seventy-fifth World Health Assembly through a decision on sustainable financing, adopted the recommendations of the Member States Working Group on Sustainable Financing, contained in Appendix 2 of the Working Group’s report to the Seventy-fifth World Health Assembly. As part of the recommendations, the Secretariat was requested to “explore the feasibility of a replenishment mechanism to broaden further the financing base, in consultation with Member States and taking into consideration the Framework of Engagement with Non-State Actors; and to present a report that includes relevant options for Member States to consider, to the Seventy-sixth World Health Assembly, through the 152nd session of the Executive Board and the thirty-seventh meeting of the Programme, Budget and Administration Committee in January 2023” (paragraph 39(f) of Appendix 2 of the Working Group’s report). In response to this request, the Secretariat reviewed the feasibility of a WHO replenishment mechanism in line with the principles set out by the Working Group on Sustainable Financing. It consulted with Member States through the work of the Agile Member States Task Group on strengthening WHO’s budgetary, programmatic and financing governance and benchmarked a set of replenishment mechanisms within and beyond the global health arena. This report outlines the Secretariat’s review and proposals on key elements of a potential WHO replenishment mechanism.