Background: Despite remarkable achievements in the oral health of populations globally, problems still remain in many communities worldwide in which dental fluorosis is one of the most common oral health diseases in endemic belt. Aim: To evaluate the prevalence of dental fluorosis in 6-12 years old school going children of District Hapur, Uttar Pradesh. Methodology: An epidemiological study was carried out on 1500 school going children from 20 schools located in urban and rural areas of 5 zones of Hapur district. A prior permission was taken from all the 20 schools and informed consent was sent to the schools prior to the day of examination. Dental fluorosis was assessed by Dean’s fluorosis index. Children were assessed for caries correlation with dental fluorosis using the DMFT index. Data was entered into MS excel and analysed with statistical software SPSS. Result: Dental fluorosis was highly observed in 11-12-year age group with 88.68% (p=0.001). Dental fluorosis's distribution among various geographical zones was highly statistically significant with highest in zone 1 and zone 5 (p=0.001). Conclusion: The findings highlight an urgent need to provide defluoridated drinking water in the affected villages to lower the burden of dental fluorosis and improve their quality of life.