SRI International (SRI) is an American nonprofit research institute headquartered in Menlo Park, California. The trustees of Stanford University established SRI in 1946 as a center of innovation to support economic development in the region.

The organization was founded as the Stanford Research Institute. SRI formally separated from Stanford University in 1970 and became known as SRI International in 1977. SRI describes its mission as creating world-changing solutions to make people safer, healthier, and more productive. It performs client-sponsored research and development for government agencies, commercial businesses, and private foundations. It also licenses its technologies, forms strategic partnerships, sells products, and creates spin-off companies.

SRI's annual revenue in 2014 was approximately $540 million. SRI's headquarters are located near the Stanford University campus. William A. Jeffrey has served as SRI's president and CEO since September 2014.

SRI employs about 2,100 people.Sarnoff Corporation, a wholly owned subsidiary of SRI since 1988, was fully integrated into SRI in January 2011.