The aim of the research was to determine the full and age specific differences in obesity and motor abilities by adolescents from two countries in two western Balkan countries in south-eastern Europe: Kosovo and Montenegro. The research was realized on a sample of 1200 respondents. Of these, 600 were from Kosovo and Montenegro, a total of 6 groups from each state (100 respondents in each groups) age (13, 14 and 15 years) and sex (boys and girls). Body height, body weight, body mass index, flamingo balance, plate tapping, sit-and-reach, standing broad jump, handgrip test, sit-ups in 30 seconds, bent arm hang, 10 x 5 meter shuttle run and 20 m endurance shuttle-run were used in the analysis. The differences in fitness tests, anthropometric measures by Kosovian and Montenegro Adolescents were examined by one-way analysis of covariance. Montenegrin and Kosovo girls and Kosovo boys indicate a smaller overweight and obesity in comparison with peer group from Europe, while boys from Montenegro are placed near to their counterparts from western and southern Europe. Kosovo adolescents of both sexes and Montenegrin male adolescents aged 13 and 14 achieve on average poorer results in the test standing broad jump and 20 meters endurance shuttle-run, but achieving better results of the test pull ups stamina compared to European peers. Montenegrin female adolescents achieve poorer results in the test standing broad jump, but better results of the test pull ups stamina compared to European colleagues.