The University of Saint Louis Tuguegarao is a private Catholic higher education institution run by the Congregation of the Immaculate Heart of Mary in Tuguegarao City, Cagayan, Philippines. It was founded in 1965 by the CICM Missionaries. It traces its roots from a diocesan secondary school named Cagayan Valley Atheneum established in 1938 by Msgr. Constant Jurgens, C.I.C.M., D.D., a Dutch by nationality, then Bishop of the Diocese of Tuguegarao and a CICM missionary and great educator. The CICM Fathers took over administration of the school in 1965 and renamed.

• The herald of the USL emblem blends the sword and the shield, symbolizing the virtue of fortitude. The sword thrusts forward toward individual and community development, the goals of education.
• The lily, symbolizing the virtue of integrity, and the cross, representing the faith in the Lord Jesus Christ, are wielded by the shield.
• The corn and rice (stalks), prime products of Cagayan, depict USLs commitment to contribute to the development of the Cagayan Province and Cagayan Valley Region.

• "Royal Blue" and "Pure White" are the colors of the Blessed Virgin Mary, signifying the love and life of a dedicated person close to Christ.
• The "Pure White" color is changed to "Yellow Gold" to represent the 50th years of existence in 2015.

Departments

The University comprises 5 departments of study, each accommodating specific courses or study fields related to one another. These are the:

- School of Engineering, Computing and Engineering (SACE), accommodating students who take up courses related to Engineering, Computer Science or Architecture.

- School of Education, Criminology, Arts, and Psychology (SECAP), for students who take up Political Science, Teacher Education, Criminology, or Psychology.

- School of Accountancy, Business, and Hospitality (SABH), for students who want to take Hotel Management, Tourism, Accountancy, or other Business-related courses.

- School of Health and Allied Sciences (SHAS), for students who want to take up healthcare-related courses like Medical Laboratory Science and Nursing.

- Basic Education School (BES), comprising the Elementary, Junior High School and Senior High School department.

Other CICM run schools include:

• Saint Louis College, San Fernando City, La Union
• Saint Louis University, Baguio
• Saint Mary's University, Bayombong, Nueva Vizcaya
• Saint Louis School College- Cebu, Mandaue City, Cebu
• Maryhurst Seminary, Baguio City
• Maryhill School of Theology, Quezon City
• University of Saint Louis Constant Jurgens Campus, Brgy. Leonarda, Tuguegarao City

• Saint Louis University, Baguio City, Benguet
• Saint Louis College La Union, San Fernando City, La Union
• Saint Mary's University, Bayombong, Nueva Vizcaya
• Ateneo de Tuguegarao