The leading challenges in public health—ranging from rising obesity rates to the fast-growing population of older adults—are complex and cannot be solved effectively by any one silver bullet or any one sector in isolation. Instead, their solutions require collaborative actions of many sectors, including industry, government, academia, and nongovernmental organizations. To better understand how to build multisectoral food and nutrition partnerships that achieve meaningful public health results, the IOM's Food Forum held a workshop on November 1-2, 2011, in Washington, D.C. The workshop brought together stakeholders from various sectors to discuss the benefits and risks of pursuing cross-sector partnerships, foster communication between sectors, and explore opportunities of mutual interest in food and nutrition that are most conducive for partnerships. Participants also discussed the perspectives of the various sectors, key features of successful partnerships, and what needs to be done to facilitate partnership development. This report, Building Public-Private Partnerships in Food and Nutrition: Workshop Summary, summarizes the workshop.