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Aim: Social and role functioning impairments characterize patients along the schizophrenia spectrum, but the existing evaluations tools do not specifically address younger population issues. The Global Functioning Social (GF:S) and Global Functioning Role (GF:R) scales have been specifically designed for that purpose. The aim of this study is to establish the reliability and concurrent validity of the French version of GF:S and GF:R scales., Methods: The two scales GF: Social (GF:S) and Role (GF:R) have first been translated into French and independently back translated and validated by the original authors. Between March 2021 and March 2022, we enrolled 51 participants (20.3 ± 3.7 years old; female = 22/51) amongst help-seekers referring to two different early mental health services in the Île-de-France. In an ecological design, participants met different diagnoses, 7 (13.7%) met the criteria for Ultra-High Risk of psychosis (UHR) using CAARMS criteria., Results: Inter-rater reliability was excellent for scores related to the past month and to the higher levels of functioning over the past year. Both scales showed good to excellent concurrent validity as measured by correlation with the Social and Occupational Functioning Assessment Scale (SOFAS) and the Personal and Social Performance Scale (PSP)., Conclusion: Overall, this study confirms the reliability and validity of the French version of the GF:S and GF:R scales. The use of these scales may improve the evaluation of social and occupational functioning in French-speaking young help-seekers, in a transdiagnostic approach, both in clinical and research settings., (© 2023 John Wiley & Sons Australia, Ltd.)