Background: In worldwide the obesity and overweight has been more than 1.9 billion in adults, 38 million in children under the age of 5 years, and over 340 million in children and adolescents aged 5-19 years. India is widely populated country with a population of 1.3 billion people spread into many states having wide economic and social disparities, health inequalities and distinct cultures. The study was conducted to assess the association of screen time usage with sleep pattern and obesity among school children during COVID-19 lockdown. Objectives: • To assess the screen time usage with sleep pattern among school children. • To assess the screen time usage with obesity among school children. • To associate the screen time usage with sleep pattern among school children. • To associate the sleep Pattern with obesity among school children. • To associate the sleep Pattern among school children with their selected demographic variables. Methods: In this study based on descriptive design using quantitative method to assess the association of screen time usage with sleep pattern and obesity among school children during COVID-19 lockdown by using purposive sampling technique. The data collection period was one week. Total sample size was 51 participants, school children. Samples were collected from selected area of Puducherry (Lawspet PHC). Result: In this study most of school children use the internet on daily basis is 51%, more than once a day 24% and once a day 25%. Majority of the school children 51% had inadequate sleep and 49% had moderate sleep pattern. This result can help to improve the sleep pattern and reduce screen time usage and obesity among school children. Conclusion: The present study reveal that school children have moderated and inadequate sleep pattern, majority of children spend on internet usage and gained overweight during COVID-19 lockdown. It is responsibility of the health care professional to create awareness on screen time usage, sleep pattern and obesity among school children during COVID-19 lockdown.