The study aimed to find the effect of gender and locality on social maturity of student teachers in Mandi district of Himachal Pradesh. Total 349 student teachers of B.Ed. college of Mandi district was taken as sample out of which 167 being males and 182 being females. In the present study Dr. Nalini Rao’s Social Maturity Scale was used. There are no significant differences on the various components of social maturity. Again, significant difference is found in the mean scores of male and female student teachers on social adequacy. Social Adequacy aspect of social maturity among student teachers is significantly affected by the interaction of gender and locality.