State University of New York at Stony Brook, commonly known as Stony Brook University is a public research university located in Stony Brook, New York, United States (on the north side of Long Island, about east of Manhattan, New York).

Stony Brook is one of the four university centers in the State University of New York system, and has an enrollment of more than 22,000 students. The University operates two SUNY-wide research centers (the Institute for Theoretical Physics, and the Marine Sciences Research Center). The University also operates Brookhaven National Labs under contract from the U.S. Department of Energy.