Abstract: The purpose of this study was to detect the correlation between age and gender with flat foot deformity in obese children. One hundred fifty children ranged in age from 8-14 years participated in this study. They were selected according to body mass index to be obese children, then they were divided according to gender into two groups, group I and group II (75 boys and 75 girls), then each group divided according to age into equal three sub groups (from 8-10 years, from 10-12 years and from 12-14 years) each sub group included 25 children. Evaluation for each child was done using the Foot Posture Index-6 and foot print. The Foot Posture Index-6 was used to asses foot posture, while foot print was used to measure Stahili planter arch index. The results of the study showed that there were significant statistical differences in Foot Posture Index-6 score and arch index between group I (boys) and group II (girls), while there were no significant statistical differences in Foot Posture Index-6 score and arch index in the subgroups according to age. It was concluded that there was significant positive correlation between gender and incidence of flat foot, while there was no significant correlation between age and incidence of flat foot.