The International Church of the Foursquare Gospel affirms classical Trinitarian doctrine as expressed in the Nicene Creed: one God eternally existing as Father, Son, and Holy Spirit, three coequal and coeternal persons in one divine being. This foundational doctrine is affirmed in the Church's Declaration of Faith and shapes all understanding of God, salvation, and the Christian life.

The Trinity is understood as the central mystery of Christian revelation — revealed throughout Scripture and definitively in the incarnation of the Son and the outpouring of the Holy Spirit at Pentecost. The three persons are distinguished by their economic roles (the work each performs in creation and redemption) while maintaining essential unity in being and attributes. The Trinity shapes Foursquare worship, theology, and understanding of the Church's mission.