Inspired by the charism of the Missionary Oblates of Mary Immaculate, Oblate School of Theology educates, forms, and renews men and women to "preach the Gospel to the most abandoned." Founded in 1903 and rooted in the Roman Catholic tradition, OST forms an international, intercultural, bilingual, and ecumenical community of learning.

OST equips students for effective ministry and witness to Jesus so that all who are called can serve their own congregations and denominations. For over 120 years, OST has been forming pastoral leaders, with a longstanding commitment to Hispanic/Latino ministry and to serving the poor and marginalized. The institution prepares persons for pastoral ministry through academic study and supervised practice, offering doctoral, master's, and certificate programs — including multiple Spanish and online offerings.