Armstrongism teaches that the Holy Spirit is not a third person of the Godhead but rather God's active power and mind. It is the supernatural force through which God acts in creation and sanctification. The Holy Spirit is shared by the Father and Son and is imparted to believers as a divine power that enables them to overcome sin and grow toward godhood.

This non-trinitarian understanding of the Spirit is central to Armstrongist theology. The Spirit is God's impersonal power—like electricity—that emanates from the two divine Beings and works in creation and salvation. It is not a separate consciousness or personhood but the active energy of God. Through receiving God's Spirit, believers share in divine nature and power, growing progressively toward the goal of becoming members of the God Family.