Our Lady of the Lake University (OLLU), known locally as the Lake, is a private Catholic university in San Antonio, Texas, United States. It was founded in 1895 by the Sisters of Divine Providence, a religious institute originating in Lorraine, France, during the 18th century. The Texas chapter of the institute still sponsors the university. Our Lady of the Lake University was the first San Antonio institution of higher education to receive regional accreditation and its Worden School of Social Service is the oldest Social Work school in Texas.

Our Lady of the Lake University offers bachelor's degrees, master's degrees, and two doctoral degree programs across its main campus and its satellite campuses in The Woodlands and in the Rio Grande Valley. The university's athletic teams, the Saints, compete in the Red River Athletic Conference (RRAC) as part of the National Association of Intercollegiate Athletics (NAIA).