Hypertension in children and adolescents is defined as systolic or diastolic (blood pressure) BP greater than or equal to the 95th percentile values for given age, gender or height on repeated BP measurements. There has been an increase in frequency of hypertension among young people in the recent time due to a number of risk factors. This is contributing globally to the increase in cardiovascular morbidity and mortality in adults. The aim in this study was to determine the prevalence of hypertension and its risk factors among apparently healthy secondary students in Osogbo, south - western Nigeria. The study was a school - based cross – sectional study which employed multi – staged stratified random sampling. A total of 404 secondary students were studied; having been selected from a total of 6 secondary schools in Osogbo town. Parental informed consents of all the students were taken prior to the study while three different visits were made to the selected schools. Self administered questionnaires were given to the respondents and anthropometric measurements were carried out on them. Six Blood pressure measurements were taken at 2 different visits by auscultation. A negative urine dip stick test result (thus excluding haematuria or proteinuria) was obtained in every subject before each BP was measured.