Background: Obesity is a condition of accumulation of abnormal or excessive fat in adipose tissue, to the extent that health may be impaired. Obesity is commonly caused by excessive food energy intake, lack of physical activity and genetic susceptibility. Few cases of obesity may be caused by endocrine disorders, medications and psychiatric illnesses. Objectives: To study the socio demographic profile and the prevalence of overweight/obesity in school children of Udaipur city. Materials and Methods: This cross-sectional study was conducted from July 2014 to June 2015, on 1000 students of class 8th, 9th, 10th of government and private schools of Udaipur city (Rajasthan). Pre-tested questionnaire was used to collect socioeconomic and demographic information with prior consent. Results: Girls (12.6%) were more, overweight/obese, than boys (8.6%). Overall prevalence of overweight/obesity was 10.60%, and the prevalence was nearly double in private schools (14.0%) than government schools (7.2%). Prevalence of overweight/ obesity was (38.68%) in the study subjects aged __ampersandsignge;16years, followed by (28.30%) in 15 years, (27.36%) in 14 years and less values in age 13 and 12 years. (87.74%) of the subjects with overweight/obesity belonged to nuclear families, (89.63%) were from SES I, II, and III while (10.37%) to class IV and V. Conclusion: Obesity is a key risk factor for emergence of chronic and non-communicable diseases, several years later in life; hence the school curriculum should include the regular educative sessions on nutritive values of different food stuff, hazards of obesity, protective food habits and healthy life style.