Background and purpose: Malocclusion which has great hazardous effects on oral function seems to have become more prevalent in recent years therefore, the present study was carried out to assess the prevalence of different malocclusions among 13-15 year-old female adolescents in Sari, Iran.

Materials and methods: This study was conducted in September 2014 to March 2015. A total of 485 school girls aged 13-15 were randomly selected from 11 schools to determine the status of their occlusion. Students who had previous orthodontic treatment or extraction of any permanent teeth and craniofacial syndrome and mixed dentition were excluded from the study. Angle's classification was used to describe the type of malocclusion.

Results: According to the results, only 12% of studied adolescents had normal occlusion, whereas 53% had Class I, 19.4% had Class II and 15.6 % had Class III malocclusion.

Conclusion: Class I malocclusion was the most prevalent, while Class III malocclusion was the least prevalent among female students in Sari.