A minor seminary or high school seminary is a secondary day or boarding school created for the specific purpose of enrolling teenage boys who have expressed interest in becoming Catholic priests. They are generally Catholic institutions, and designed to prepare boys both academically and spiritually for vocations to the priesthood and religious life. They emerged in cultures and societies where literacy was not universal, and the minor seminary was seen as a means to prepare younger boys in literacy for later entry into the major seminary.

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.