The State University of New York at Old Westbury (SUNY at Old Westbury) is a public university in Old Westbury, New York,^[4] with portions in the neighboring town of Jericho, New York.^[5] It enrolls just over 5,000 students.

The State University of New York at Old Westbury was founded in 1965 as the State University of New York College at Old Westbury by the State University of New York (SUNY) Board of Trustees. It began in 1968 at Planting Fields, the former Coe Estate and arboretum in Oyster Bay, New York. In 1971, the university moved to its present Old Westbury site in Nassau County, Long Island – an estate, known as "Broad Hollow," formerly owned by agriculturist, industrialist, sportsman and philanthropist F. Ambrose Clark.^[6]

The first president of the Old Westbury campus college was John D. Maguire, who had been a religion professor at Wesleyan University and a civil rights activist. He aimed to create a university devoted to social justice and racial equality.^[7]

In 1986, L. Eudora Pettigrew became president of Old Westbury, becoming the first African-American college president in the SUNY system.^[8]

In 2023, the college gained status as a university, becoming the State University of New York at Old Westbury.^[9]

There are over 50 degree programs available at the university.

Of the university's 166 full-time professors,^[10] approximately 80% hold the highest degree in their discipline. Eight members of the faculty have been named Distinguished Teaching or Service Professors by the State University of New York,^[11] which are among the highest ranks available in the university system.^[12]

Academic offerings are housed in four schools.

• School of Arts and Sciences
• School of Business at SUNY-Old Westbury which is accredited by the Association to Advance Collegiate Schools of Business (AACSB)^[13]
• School of Education
• School of Professional Studies which offers evening, online, hybrid, and weekend courses

The university's current president is Timothy E. Sams.

The university's school week runs on a Monday–Thursday schedule, instead of Monday–Friday as at most colleges and universities. Students taking science courses usually (but not always) have labs scheduled on Fridays.

The university also has a "dry campus" policy – no alcohol allowed.

SUNY Old Westbury teams participate as a member of the National Collegiate Athletic Association's Division III.^[14] The Panthers are a member of the Skyline Conference. Men's sports include baseball, basketball, cross country, golf, soccer and volleyball; while women's sports include basketball, cross country, lacrosse, soccer, softball and volleyball.

• Kool Moe Dee, rapper
• Kevin J. Greene, lawyer and law professor
• Craig S. Harris, avant garde jazz musician
• David Liederman, chef and businessman
• John McTiernan, movie producer
• Andrea Navedo, actress
• Lester Prosper, professional basketball player