This study aimed to identify the level of belief in school justice and its relation with the level of social and psychological skills and academic achievement among students of primary and secondary government schools in Tulkarm region. For this purpose the researchers used a scale of belief in school justice consists of (24) items distributed equally into three domains: School administration justice, laws and regulations justice, and teachers' justice. The study sample consisted of (425) male and female students. Results showed that students' estimates of the level of belief in school justice was medium in general, and on the total scale and sub-domains of the scale, results showed no statistically significant of differences in the level of belief in school justice among students primary and secondary due to sex variable. On the other hand, results showed a statistically significant differences in the level of belief in school justice among students of primary and secondary education due to the level of education variable, and on the total scale of the school justice, and laws and regulations and teacher's justice domains. while results showed that there is no statistically significant differences on the domain of school of administration justice. There is a statistically significant positive correlation between the belief in school justice level among primary and secondary students and the level of social, psychological and academic achievement of them, on the total and sub-domains of the scale.