Background: Adolescent health is important as theyare under a great amount of stress due to academic and peer pressures. This study aims to determine prevalence of pre-hypertension and hypertension in school adolescents and to identify diet as a risk factor in these children.Methodology - Cross sectional study was conducted among school adolescents(11- 14years). Anthropometric and blood pressure measurements were taken. 24 hour recall method was used to record the dietary intake and the total sodium, potassium, fat, fructose, caffeine, uric acid and fiber in the diet was estimated. Results - 500 adolescents were studied. Among the study population 6.4% were pre-hypertensive and 7.4% hypertensive with increased prevalence in girls. 9.8% were obese and 14.2% overweight. 14.3% obese and 11.3% overweight children had pre-hypertension. 30.6% obese and 9.9% overweight children had hypertension. Dietary analysis showed that normotensive children consumed lesser fructose (258mg), fat (12.8gm), sodium (89mg), and uric acid with more potassium (89mg), and fiber (10.2gm) per day as compared to the hypertensive children. Conclusions: There is high prevalence of asymptomatic hypertension among obese and over-weight school adolescents. Dietary differences were found between the hypertensive and normotensive adolescents with increased fat consumption showing statistical correlation with hypertension.