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We test the factorial equivalence of the Pacific Identity and Wellbeing Scale–Revised (PIWBS-R) across the four largest Pacific Nations groups in New Zealand (Samoa, Cook Islands, Tonga, Niue). Using Multigroup Confirmatory Factor Analysis (N= 684) we show that the PIWBS-R exhibits similar properties within each Pacific group. Results indicate that across the four groups, the PIWBS-R shows the same basic factor structure, item factor loadings and intercepts. We also compare the group means for the individual factors of the PIWBS-R, whilst statistically adjusting for demographic covariates. Results showed a small but significant difference in Religious Centrality and Embeddedness, where Tongan participants scored higher relative to both Cook Island and Niuean participants. These results mirror population proportions of religious affiliation within Pacific groups in NZ. There were no other significant differences between groups in the other factors of the PIWBS-R. Together, these results provide strong evidence of the PIWBS-R as a valid tool for research with Pacific peoples at a general level, and within specific Pacific ethnic groups.