Abstract: IntroductionChildhood obesity is termed as excess body fat accumulation which negatively affects a child's health or well-being. As methods to work out body fat directly are difficult, the diagnosis of obesity is usually supported by BMI. A Body mass Index of 30 or more is considered as obesity. Children are considered to be obese if they are above the normal weight for their height in relation to their age. The problem is global and is steadily affecting many low and middle income countries. The rising prevalence of obesity in children and its many adverse health effects it's being recognized as a significant public health concern. AimThe aim of this study is to assess the Knowledge, awareness and risk factors of childhood obesity among the adolescent population. Materials and MethodThis is a survey based study and was conducted on an online forum, Survey Planet with a sample of 100 participants .Adolescents of age group between 10-21 participated in the study. A questionnaire with 10 questions was circulated among the Chennai population. The responses were collected. The data was summarised as the number and percentage and analysed using SPSS.Chi square test was done and a P value of < 0.05 was considered statistically significant. ResultsIn this survey, we observed that 29% of them consider their current weight to be harmful for their health. 40% of them check their weight regularly. Half of the population were aware that chronic stress can lead to weight gain. Only 41% of the participants have the habit of exercising regularly. 67% of the participants were aware of the complications of obesity. Among all the respondents 28% of them had a family history of obesity. ConclusionWithin the limits of this survey, we can conclude that awareness on childhood obesity is present among the adolescent population. Females were more aware of Childhood obesity than males. However regular exercise and healthy diet is essential to maintain a healthy weight and prevent obesity.