The Salvation Army affirms the classical Christian doctrine of the Trinity, understanding God as eternally existing in three persons—Father, Son, and Holy Spirit—while maintaining complete unity of substance, power, and eternity. This is clearly stated in the Eleven Articles of War, which form the doctrinal foundation of the Salvation Army's faith and practice. The Salvation Army Handbook of Doctrine confirms this orthodox Trinitarian theology.

The Salvation Army's Trinitarian faith reflects its evangelical heritage and alignment with mainstream Christian tradition. The doctrine is essential to Salvation Army theology and is affirmed across all ranks and territories. The three persons of the Godhead are understood as equally divine, though each has a distinct function in the work of creation, redemption, and sanctification.