JSI Research & Training Institute, Inc. (JSI) is a global nonprofit organization dedicated to improving the health and well-being of individuals and communities worldwide. Established in 1978 by Joel Lamstein and Norbert Hirschhorn, JSI focuses on enhancing health outcomes through training, technical assistance, strategic planning, needs assessments, research, and program evaluations.

The institute collaborates with both public and private health sectors to strengthen health systems and promote equitable access to quality health services. Headquartered in Boston, Massachusetts, JSI operates with a team of over 3,200 professionals committed to addressing pressing healthcare challenges globally.