The study examines the psychometric properties of the General Self-Efficacy (GSE) scale across 25 countries, testing whether the measure is configurally equivalent across cultures. The GSE scale, designed to measure broad and stable personal competence, has been adapted into 28 languages. The research aims to confirm the unidimensionality of the construct and explore cross-cultural differences. The findings support the unidimensionality of the GSE scale, indicating that it is a universal construct. However, significant mean differences were observed between countries, with Costa Ricans reporting the highest GSE levels and Japanese the lowest. Gender differences were also noted, with slightly lower GSE levels among women in some nations. The study suggests that cultural and methodological factors may contribute to these differences, highlighting the need for further research to understand the underlying causes.The study examines the psychometric properties of the General Self-Efficacy (GSE) scale across 25 countries, testing whether the measure is configurally equivalent across cultures. The GSE scale, designed to measure broad and stable personal competence, has been adapted into 28 languages. The research aims to confirm the unidimensionality of the construct and explore cross-cultural differences. The findings support the unidimensionality of the GSE scale, indicating that it is a universal construct. However, significant mean differences were observed between countries, with Costa Ricans reporting the highest GSE levels and Japanese the lowest. Gender differences were also noted, with slightly lower GSE levels among women in some nations. The study suggests that cultural and methodological factors may contribute to these differences, highlighting the need for further research to understand the underlying causes.