Health Impact Assessment (HIA) and Health in All Policies (HiAP) are policy tools used to include health considerations in decision-making processes across sectors such as transportation, education, and criminal justice that can play a role in improving health and equity. This article summarizes proceedings from an international convening of HIA and HiAP experts held in July 2019 in Barcelona, Spain. The presentations and panel discussions included different models, best practices, and lessons learned, including from government, international banks, think tanks, and academia. Participants discussed ideas from around the world for cross-sector collaboration to advance health. The convening covered the following topics: community engagement, building greater understanding of and support for HiAP, and exploring how mandates for HIA and HiAP approaches may advance health and equity.