The study aimed at investigating the degree of post basic education students\' knowledge about social dimension indicators of sustainable development. A random sample consisted of (1224) males and females students were selected from grade 12 from four governorates: Muscat, Al-Batinah, Al-Dakilah, Al-Sharqia. Data was collected by using a knowledge test which consisted of (26) questions. The validity and reliability of the test were examined. The findings revealed that post basic education students\' had low level of knowledge about social dimension indicators of sustainable development. The results also showed that there were significant differences in students\' knowledge with respect to gender in favor of female students. The results also revealed that there were no significant differences (α = 0.05) in students\' knowledge of social dimensions indictors of sustainable development due to their province expect in population domain in favor of Al-Dakililah. The researcher recommended enhancing the level of students\' knowledge about indicators of social dimensions and suggested further studies in the field. Key word: sustainable development, social dimension indicators, post basic education students, Oman.