This technical paper provides an overview of the practices of the following multilateral development banks (MDBs) in supporting climate-relevant sectors: the African Development Bank, the Asian Development Bank, the World Bank (International Bank for Reconstruction and Development and International Development Association), the European Investment Bank, the Inter-American Development Bank and the European Bank for Reconstruction and Development. Information on the International Finance Corporation, the branch of the World Bank that provides private-sector support, is also included. The findings and analyses presented in this paper are based on inputs provided by MDBs, data from the Organisation for Economic Co-operation and Development Creditor Reporting System system, and information available in a background paper prepared by the UNFCCC secretariat, which covers an assessment of the investment and financial flows needed in 2030 to meet worldwide mitigation and adaptation requirements under different scenarios of social and economic development. Chapter II of the paper provides an overview of current and future needs of investment and financial flows to address climate change in developing countries, by referring to some key conclusions of the UNFCCC background paper. This is followed by an overview of practices and activities undertaken by the different international financial institutions. Chapter IV analyses lending by MDBs to different sectors relevant to mitigation and adaptation actions, and chapter V summarizes the conclusions