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Context: The Neonatal Infant Pain Scale (NIPS), initially developed in Canada, has been previously used but not adequately adapted and validated for use in Brazil., Objectives: The goal of the present study was to perform a cross-cultural adaptation and clinical validation of the NIPS for use in the Brazilian population., Methods: The instrument was adapted based on the method outlined by Beaton et al., including the production and combination of translated versions, back-translation, committee review, and pilot testing. The psychometric properties of the adapted instrument, including its validity, reliability, and internal consistency, were tested in a clinical validation study. The sample comprised 60 at-term newborns who were evaluated by six nurses as they experienced vaccination. Psychometric properties were evaluated using Student's t-tests, prevalence-adjusted and bias-adjusted kappa scores, the Bland-Altman method, and Cronbach's alpha coefficients., Results: The Brazilian version of the NIPS (Escala de Dor no Recém-Nascido [NIPS-Brazil]) demonstrated excellent interobserver and intraobserver reliability. Total NIPS-Brazil scores yielded prevalence-adjusted and bias-adjusted kappa scores of 0.93, whereas the Bland-Altman method revealed interobserver and intraobserver reliability values of 95% and 90%, respectively. The NIPS-Brazil had adequate internal consistency, as evidenced by a Cronbach's alpha of 0.762., Conclusion: The NIPS was successfully adapted for use in Brazil and is now available for use in the assessment of acute pain in at-term newborns in Brazil., (Copyright © 2015 American Academy of Hospice and Palliative Medicine. Published by Elsevier Inc. All rights reserved.)