Molloy University is a private Catholic university in Rockville Centre, New York, United States. Initially founded as a school for women, it is now co-educational. It provides more than 69 undergraduate, graduate, and doctoral degree programs for over 5,000 students.

In 1955, the Dominican Sisters of Amityville founded Molloy Catholic College for Women on 25 acres in Rockville Centre, Long Island, which was purchased by the Sisters of St. Dominic. When the college opened, Anselma Ruth was its first president and the school offered two degrees, education and nursing. A year after it opened, the first institutional building, named Quealy Hall, opened. Soon after, Mother Bernadette de Lourdes, O.P., was appointed as the second president, followed by the opening of Kellenberg Hall. In 1959, the first commencement ceremony took place, celebrating the first graduating class.

In 1971, the decision was made to drop "for Women" from the school name. In 1972, Molloy began accepting men into the nursing program and in 1982 became fully coeducational.

The college opened Fitzgerald Hall, the first of three student residence halls, as well as Public Square and Madison Theatre in 2011. In 2013, the Molloy Clinic opened in the Village of Rockville Centre. In 2013, the school's Maria Regina Hall underwent renovation and was converted into a residence hall that opened in the fall of 2014. Before the renovation, the hall was used by the nursing faculty and the college's Public Safety offices. The top floor of the hall served as a convent for the Sisters of Saint Dominic. The few sisters who still lived in the convent moved back to the Dominican priory in Amityville before the renovation.

In 2019, the college's residence quad, McGovern Plaza, was dedicated, and the Drew and Karen Bogner Hall, a new dorm, opened. The following year, Molloy announced James Lentini as president.

In March 2022, the New York State Board of Regents approved the change from Molloy College to Molloy University. The name change was effective June 1, 2022, and the university adopted a new logo.

Molloy University employs 191 full-time faculty, with 87% holding terminal degrees in their field. Molloy's student-faculty ratio is 10 to 1. The university accepts around 77% of its applicants. The four schools are School of Arts and Sciences, School of Business, School of Education and Human Services, and the Barbara H. Hagan School of Nursing and Health Sciences.

The class of 2022 consisted of 908 undergraduates, 409 masters graduates, and 28 doctoral degree recipients.