Background: overweight and obesity are well known risk factors for high morbidity and mortality rates and are associated with chronic diseases including hypertension and diabetes. Objectives: evaluating the prevalence of hypertension (HTN) and diabetes mellitus type II (DMT2) in overweight and obese adult Saudi population. Methods: a cross sectional community based study was undertaken among 549 of overweight and obese Saudi subjects in Riyadh region, Kingdom of Saudi Arabia (KSA).All enrolled volunteers were subjected to the following clinical history taking, calculating BMI, diagnosis of HTN and measurement blood pressure. Results: the age of the subjects was 20-35 years old in 23.9%, 48.2% were 36-50 years old and 27.9% were older than 50 years old. About 55%of respondents were females and 45% were males. 60.8% of subjects were overweight and 39.2% were obese. The HTN and DM prevalence were found to be significantly higher among obese subjects than overweight group. Conclusion: the results indicated that obese subjects were at increased risk of hypertension and diabetes. Also, obese females were more susceptible to DM and HTN than men.