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The Weizmann Institute of Science is a multidisciplinary public research institution located in Rehovot, Israel. It was founded in 1934 as the Daniel Sieff Research Institute, and renamed in 1949 in honor of Chaim Weizmann, Israel's first president and a scientist. The Institute is not a commercial company and is not publicly traded on any stock exchange.

The Weizmann Institute focuses on basic scientific research across mathematics, physics, chemistry, biology, and computer science. While the research is primarily aimed at advancing scientific knowledge, many findings have led to commercial applications in biotechnology, medicine, and technology. Yeda Research and Development, the Institute's commercial arm, is responsible for technology transfer and licensing patents arising from the Institute's research.

The Weizmann Institute is located in Rehovot. The Institute employs scientists, researchers, and graduate students, with all academic and research activity concentrated on the Rehovot campus.