Background-Lesions of the oral mucosa are located in the soft tissue of the oral cavity. Most of the studies describe the prevalence of oral mucosal lesions mainly in an adult population and only few reports have been published about pathological lesions of the oral mucosa in pediatric population. Method-An observational cross-sectional study was conducted, with non-probability sampling with a sample of 110 patients of 6-12 years age range group and confidence level 95 %. Result-We found 30 % children with oral mucosal lesions. The presence of oral mucosal lesions was registered in the clinical records. In 101 patients a prevalence of 37.62 % oral mucosal lesions was observed. Conclusion-The most frequent lesion was the minor aphthous ulcer (21.5 %) followed by irritation fibroma (15.7 %), traumatic ulcer (15.7 %), traumatic erosion (10.2 %), impetigo (10.2 %), pigmented lesion, recurrent herpes labialis, intraoral herpes, mucocele and ranula (5.2%). Keywords: Oral mucosal lesions, Uttar Pradesh, pediatric population, aphthous stomatitis, angular cheilitis.