Back Ground: Oral hygiene plays an important role in the well being of an individual. Obesity is a growing health related problem worldwide. Oral hygiene could have a relation with weight of the participants. Aim: To correlate the prevalence of oral hygiene status and body mass index of school children (3-16years) of Takkellapadu village. Material and Methods: The study design was cross sectional which included 150 school children of age 3-16 years in which 94 boys and 56 girls. Information regarding height and weight of the study participants were recorded by using standardized measuring scale and weighing machine there after BMI was calculated. Data was analyzed by using SPSS Version 22. Oral hygiene status of the study subjects was assessed using oral hygiene index simplified. Results: Among the study participants 94(62.7%) were boys and 56(37.3%) were girls. Oral hygiene status was fair among 99(66%) of children. BMI was <18.5 among 119(79.3%) underweight children. Among boys and girls there was no significant difference in oral hygiene status. Conclusion: From the analysis, it was concluded that oral hygiene status had a significant effect on BMI. Age with oral hygiene status was significant with correlation value 0.04 levels.