St. Mary's Seminary and University is a Catholic seminary located within the Archdiocese of Baltimore in Baltimore, Maryland; it was the first seminary founded in the United States after the Revolution and has been run since its founding by the Society of the Priests of Saint Sulpice.

A seminary, school of theology, theological college, or divinity school is an educational institution for educating students in scripture and theology, generally to prepare them for ordination to serve as clergy, in academics, or mostly in Christian ministry.