Jeffrey Stuart Hammer (born November 3, 1953) is a health and development economist. Hammer was the Charles and Marie Robertson Visiting Professor of Economic Development at the Woodrow Wilson School of Public and International Affairs of Princeton University. His primary research focus is the economics of health policy and health service provision in poor countries. He was on the core team of the 2004 World Development Report “Making Services Work for Poor People,” alongside Lant Pritchett, Shanta Devarajan, and other notable economists. He is currently a senior non-resident scholar at the National Council of Applied Economic Research in Delhi, and Director of the One Hundred Homes project.