The CRCNA affirms the classical doctrine of the Trinity as articulated in the Belgic Confession (Articles 8–11) and the Heidelberg Catechism. God is one in essence and three in persons — Father, Son, and Holy Spirit — each fully divine, equally eternal, and worthy of worship. The three persons are distinct yet inseparable, sharing one divine nature, will, and attributes.

This Trinitarian confession stands firmly within the Nicene and post-Nicene ecumenical tradition. The CRCNA's subordinate confessions do not permit denial of the Trinity, and this doctrine is considered foundational to all Christian faith. The Three Forms of Unity explicitly reject subordinationism and arianism, affirming instead the co-equality and co-eternity of all three persons.

The Spirit's procession from both the Father and the Son (the filioque clause) is affirmed in CRCNA theology, consistent with Western Reformed tradition. This understanding shapes the CRCNA's emphasis on the unified work of the Godhead in creation, redemption, and sanctification.