List of colleges and universities on Long Island

This is a list of colleges and universities entirely in, or with a campus in Nassau or Suffolk County. For institutions in the Long Island sections of Brooklyn and Queens, two of New York City's five boroughs, see the separate List of colleges and universities in New York City.

Stony Brook University West Campus

Public:

• Institutions of the State University of New York
  • Stony Brook University, including the main Stony Brook campus and the Stony Brook Southampton campus
  • SUNY College at Old Westbury
  • Farmingdale State College (Farmingdale)
  • Nassau Community College (East Garden City)
  • Suffolk County Community College – three main campuses: in Selden, Brentwood, and Riverhead, and two "satellite centers" in Sayville and downtown Riverhead
• Federal Service Academies
  • United States Merchant Marine Academy (Kings Point)

Hofstra University student center

Private:

• Adelphi University in Nassau County (main campus in Garden City) and Suffolk County (an Education and Conference Center in Hauppauge)
• Briarcliffe College – in Queens at Long Island City; Nassau at Bethpage; and Suffolk at Patchogue
• Five Towns College in Suffolk County (Dix Hills)
• Hofstra University in Nassau County (Hempstead and Uniondale)
• Long Island University: C. W. Post Campus in Brookville in Nassau County, and two branch campuses in Suffolk County at Brentwood and Riverhead, and Brooklyn
• Molloy College – in Nassau County (Rockville Centre)
• New York Institute of Technology – main campus in Nassau (Old Westbury), campus also in Suffolk (Central Islip) and Manhattan
• Polytechnic Institute of New York University (formerly Polytechnic University, now part of NYU) – has a "Long Island Graduate Center" in Suffolk, at Melville, as well as the main campus in Brooklyn
• St. John's University – Main campus in Queens, with a graduate center in Suffolk (Oakdale)
• St. Joseph's College – campuses in Brooklyn and Suffolk (Patchogue)
• Touro Law Center in Suffolk County (Central Islip)
• Watson School of Biological Sciences in Nassau County (Laurel Hollow)
• Webb Institute in Nassau County (Glen Cove)