Messianic Judaism affirms classical Trinitarian theology while employing Hebrew and Jewish theological terminology. The one God of Israel (YHWH) is revealed as three distinct persons in eternal divine unity (echad). Father, Son, and Holy Spirit are understood as coequal in power, glory, and eternality, following the pattern established in rabbinical thought and mystical Judaism. The MJAA (Messianic Jewish Alliance of America) and UMJC (Union of Messianic Jewish Congregations) both affirm the Trinity in their official doctrinal statements, though expressed through Jewish categories rather than Hellenistic language.

The filioque clause (the Spirit's procession from both Father and Son) is affirmed, though Jewish theological terminology is preferred when discussing the Spirit's origin and role. Hebrew phrases like "Ruach HaKodesh" (the Holy Spirit) are used alongside personalist language about the Spirit's operations in the community. This represents a conscious effort to maintain Jewish theological identity while holding orthodox Christian doctrine on the nature of God.