The Community Service Attitudes Scale (CSAS) is a 46-item measure designed to assess students' attitudes towards community service in higher education. The study aimed to cross-culturally adapt and validate the CSAS to European Portuguese. The CSAS was translated into Portuguese and back-translated, content validation was performed by a review committee, and a pretest was completed by 30 undergraduate students. To assess content/face validity, reliability and stability participants were recruited from January to April 2023 at a higher health school. They completed an online questionnaire (Google Forms) on two occasions, one week apart. Ninety-five undergraduate health students completed the scale. 59.4% females and 40.6% males, age 21.04 (±1.79), 57.3% without previous community experience. Cronbach's alpha was greater than .80 for all dimensions of the instrument, the CSAS total score (.97) and the CSAS subscales (ranging from .88 to .95), indicating very good internal consistency. The intraclass correlation coefficient (ICC) obtained between test-retest, the total CSAS ICC was .96 and the ICC subscales ranged from .86 to .94, confirming good reliability. The Portuguese version of the CSAS (CSAS_P) is a valid and reliable instrument to assess university students' involvement and attitudes towards community service.