Introduction. The pandemic of obesity in adolescents is one of the challenges of public health. Aim. The aim of this study was to examine the association of overweight with demographic, socioeconomic and lifestyle factors among Serbian adolescents. Method. A cross-sectional study of 2139 adolescents aged 10 to 19 years was carried out. Data used in this study were from the 2006 Health Survey. In accordance with the international sex- and age-specific Body Mass Index cut-off points, all participants were classified as being normal weight or overweight, including obese. The association between the risk factors and overweight were examined using a multivariate logistic regression model. Results. The study showed that 28.9% of boys and 17.0% of girls were overweight, while 14.5% of boys and 8.1% of girls were obese. Boys were more likely to be overweight/obese, compared with girls. Being younger (p< 0.01 for 14 to 15 years) and (p< 0.01, for 16 to 19 years), engaging in physical activities that last less than 7 hours a week, in such a manner that they breathe quickly and become sweaty, (p< 0.01) and skipping breakfast (p< 0.05) were risk factors significantly associated with overweight among adolescents. No significant association was found with wealth index. Conclusion. These findings should be an integral part of further preventive interventions, especially oriented towards younger adolescents, who are physically inactive, have a habit of skipping breakfast and are boys. Namen. Pandemija debelosti pri mladostnikih predstavlja enega večjih izzivov za javno zdravje. Cilj. Cilj te raziskave je bil preveriti povezanost prekomerne telesne teže med srbskimi mladostniki z demografskimi in s socialno-ekonomskimi dejavniki ter z dejavniki, ki so povezani z načinom življenja. Metoda. Narejena je bila presečna študija z 2.139 mladostniki, ki so bili stari od 10 do 19 let. Za podatke v tej študiji so bile uporabljene vrednosti iz Health Survey 2006. Glede na mednarodno sprejete vrednosti indeksa telesne mase, povezane z odgovarjajočim spolom in starostjo, so bili vsi udeleženci uvrščeni v skupine z normalno težo, s prekomerno telesno težo in z debelostjo. Za ugotavljanje povezave med dejavniki tveganja in prekomerno telesno težo je bila uporabljena statistična metoda multivariantne logistične regresije. Rezultati. Raziskava je pokazala, da je imelo 28,9% fantov in 17,0% deklet zvišano telesno težo, in sicer je bilo 14,5% fantov in 8,1% deklet debelih. V primerjavi z dekleti so bili fantje debelejši ali so imeli zvišano telesno težo. Za naslednje dejavnike tveganja smo ugotovili statistično pomembno povezavo s prekomerno telesno težo med mladostniki (starost 14-15 let (p<0,01) in 16-19 let (p<0,01)), ukvarjanje s telovadbo, ki povzroča hitro dihanje in potenje manj kot 7 ur dnevno(p< 0,01), ter vsakodnevno izogibanje zajtrku (p< 0,05). Na drugi strani ni statistično pomembne povezave med zvišano telesno težo/debelostjo in indeksom družinskega bogastva. Zaključek. Ugotovitve naše študije bi lahko imele vpliv na preventivne ukrepe, ki bi bili posebej usmerjeni v mladostnike moškega spola, ki ne zajtrkujejo in se ne ukvarjajo z redno telesno aktivnostjo.