This publication seeks to inform practitioners on how to more effectively deploy resources towards private sector climate adaptation projects in the developing world. The report examines the evidence base on efforts to support private sector investment in climate adaptation. Analysis shows that multilateral development banks (MDBs) and the Pilot Program for Climate Resilience (PPCR), a funding window of the Climate Investment Funds (CIF), are at the forefront. In the challenging, complex field of private sector adaptation, MDBs are uniquely positioned to provide the technical and financial support that lenders and investors need to overcome barriers to action. The PPCR draws on the comparative advantages of the five MDBs that implement its funding, and today is the only multilateral climate fund supporting private sector adaptation projects.