Trinity International University is affiliated with the Evangelical Free Church of America (EFCA), an association of some 1,500 autonomous and interdependent churches and church plants united by a mutual commitment to serve the Lord Jesus Christ under the guidance of the Holy Spirit and obedience to the Word of God. The EFCA is seeking to fulfill the Great Commission which Christ has entrusted to His Church. The growing ministry of the EFCA currently extends to some 50 countries of the world. 

The EFCA regards Trinity as its gift to the wider evangelical community, making its educational offerings accessible to students from a wide variety of denominations. Indeed, the majority of Trinity students represent non-EFCA churches.  The nature of the university allows breadth for Christians from many different backgrounds to study, worship, and serve together.