Since completing her doctorate, Mia Cruz has been teaching undergraduate core theology courses at Boston College and Ateneo de Manila University (Philippines). In the classroom, she has consistently aimed at making theology accessible to her students. 

Her teaching interests reflect theological themes that have been significant in her own study and formation: Sensus fidei and Sensus fidelium, Catholic social teaching, Vatican II ecclesiology, popular Catholicism, participation in the church, liberation theologies, contextual theologies, theologies of migration, theologies of vocation, and Ignatian spirituality, particularly as a means to cultivate deeper interiority within her students.