Jean Olson "Jenny" Lanjouw (April 15, 1962 – November 1, 2005) was an American economist, economics professor at Yale University and associated professor at the University of California, Berkeley's Department of Agricultural and Resource Economics. She undertook empirical work on poverty and economic development, developed statistical tools to project poverty and inequalities at the local level, and a policy system to provide access to drugs for developing countries without violating drug manufacturers' patents.