This study aims to identify the relationship between self- Consciousness and the irrational thoughts and how this relationship may vary on the basis of sexual differentiation. The sample of the study consists of (330) students from the first secondary class (150 male, 180 female). The study has used the self- Consciousness scale (Fenigstein, et.al., 1975) and the irrational thoughts scale (Al-mougharbel, 2010). The findings indicate that there is a statistically significant relationship between the private and the public selfconsciousness along with the irrational thoughts. In addition, there are differences in self- Consciousness resulting from sexual differentiation and are in favor of females. There are also no differences in the irrational thoughts depending on the basis of sexual differentiation.