The main purpose of this investigation is to find out the sex differences in personality traits and locus of control among school children. A total 60 children (30 boys and 30 girls) were taken as a sample. The research tool for personality, children personality questionnaire was used, which was made by Cattell and Porter. Locus of control was measured by Rotter's Locus of Control Scale. t-test was applied to examine the significance of personality and locus of control in children. Results revealed significant difference in 14 personality factors and not significant difference in locus of control, in respect to both boys and girls.