This research was conducted in order to determine the relationship between Physical performance and self esteem among the children aged between 12-14 in terms of age, gender and participation in sports and exercises. The research was conducted with 865 students from Izmir city center who participated voluntarily (407 females, 458 males; 270 active and 595 not active sports participants). Some anthropometric and Physical tests were administered to determine the students' Physical performance. The motor performance tests used were as follows: right-left hand grasp strength and standing long jump for muscle strength, 30 second shuttle test for muscle endurance, sit-reach test for flexibility, 30 meter run test for speed, and 1 mile (1609 meters) run test for cardiovascular endurance. To determine self esteem level, the short school form of the Coopersmith Self Esteem Inventory (1967) was used. The characteristics of Physical performance and self esteem were investigated among the groups (in terms of age, gender and status of sports participation) using variance analysis at 3x2x2 level and Bon-ferroni test. The anthropometric measurements, physical performance and self esteem scores of the female students and male students who participated in physical activity were higher than those of the female students and male students who did not participate in sports. Statistically significant relationships were found between self esteem of the children aged between 12-14 who actively participated in physical activity and their strength, speed and cardiovascular endurance.