Balance is one of the most important abilities for application of throwing techniques in judo, especially among younger age categories in technique learning phase, which are often performed on single leg. Practice is showing the fact that today’s children are more subjected to foot arches deformation for many reasons. The objective of this work was to determine the connection between flat feet and balance in basic and specific tests among young judokas. 44 female and male judokas, born in 2008. and 2011., were chosen for this work. Participants were assigned to four groups, depending on flat foot grade, what is specified with clinical test. All participants were measured in three variables, on right and left leg: Standing Stork Test (SST), Modified Standing Stork Test (MSST) and Dynamic Standing Stork Test (DSST). Results are showing significant difference between subject groups in Modified Standing Stork Test and Dynamic Standing Stork Test. There is no significant difference in Standing Stork Test because of the inadequacy of the test for this age. This work proves significant connection between flat feet and balance in judo that has great impact on application of throwing techniques which are most often performed on single leg.