This study examines the determinants of tolerance among higher education students in Montenegro and their implications for educational and societal sustainability. Guided by the framework of Education for Sustainable Development (ESD), it investigates how socio-demographic factors, economic insecurity, political orientations, and digital media use shape attitudes toward ethnic, religious, and cultural diversity. Cross-sectional survey data were collected from 469 students in 2021 and analysed using binary logistic regression. Results show that education is the strongest predictor of tolerant attitudes (p < 0.01), highlighting the transformative role of higher education in fostering inclusive and sustainability-relevant competencies. Economic insecurity, particularly unemployment, was associated with more exclusionary views, linking social equity to sustainability outcomes. Gender (p < 0.001), age (p = 0.07), and engagement with human-rights content online (p < 0.01) also emerged as significant predictors. Religiosity showed a modest negative association with tolerance (p = 0.01). The final model explained 37% of the variance in tolerant attitudes (Nagelkerke R2 = 0.37). Digital media played an ambivalent role: while it increased exposure to diverse perspectives, it also contributed to polarization, underscoring the need for critical digital literacy within ESD-aligned curricula. Overall, the findings demonstrate that inclusive education, digital competence, and participatory learning environments are central to building tolerant, cohesive, and sustainability-oriented societies. The study contributes to ESD scholarship by linking social inclusion, sustainability competencies, and the role of higher education in post-transition contexts.
