The Evangelical Covenant Church affirms the classical doctrine of the Trinity as expressed in the historic creeds and in the ECC's affirmations of faith. God is one in essence yet three in persons — Father, Son, and Holy Spirit. Each person is fully divine, co-equal in power and glory, and worthy of worship. The Trinity is foundational to Christian faith and is affirmed throughout ECC teaching and worship.

The ECC stands in continuity with the early ecumenical councils (Nicene and Chalcedonian) and affirms that the Trinity is a revealed doctrine grounded in Scripture. While the precise philosophical language (substance, person, nature) developed in the early church, the trinitarian reality itself is biblical. The ECC does not mandate any single philosophical explanation of the Trinity but affirms the doctrine itself as essential to orthodoxy.

The three persons of the Trinity are understood as having distinct roles in the economy of salvation: the Father as Creator and source of all being; the Son as Redeemer; the Holy Spirit as Sanctifier and sustainer of the church. Yet these distinctions do not imply subordination or inequality. The Trinity is both the foundation of Christian monotheism and the ground of the complexity and richness of Christian experience and worship.