Our Lady of the Lake University (OLLU) is an independent Catholic, co-ed university located 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 school of Social Work in Texas.