Introduction: World Health Organization revealed 13% of all deaths globally related to hypertension making it an area of prime importance for public health in both developing and developed Country. The problem of hypertension is significant in low and middle income countries like sub-Saharan Africa; however, there are limited studies to report the exact prevalence rate in developing countries, particularly in Ethiopia. Therefore, the aim of this study was to determine prevalence of hypertension among patients with type 2 diabetes mellitus and its socio demographic factors in Nigist Ellen Mohamed Memorial Hospital Hosanna, Southern Ethiopia. Methods: Hospital based cross-sectional study was conducted in 140 randomly selected adult type 2 Diabetes Mellitus patients in Nigist Ellen Mohammed Memorial Hospital, Southern Ethiopia. Data was collected by measuring blood pressure of the study participants by using calibrated devices and interviewer administered questionnaires were used to assess prevalence and socio-demographic factors among the study participants. The collected data were entered, cleared and analyzed by using SPSS 20.0 version. Result: Mean (±SD) age of the clients was 46.5(±11.8) years and majority (63.6%) was male. The mean (±SD) Systolic blood pressure and Diastolic blood pressure of study subjects among type 2 Diabetes Mellitus clients were 135.98 (±17.11) and 88.89 (±12.77) mmHg respectively. More than half (55%) of the type 2 diabetic clients in this study were hypertensive. Finally, there is a significant association between age, gender, marital status, residence and average working hours. Concussion: Prevalence rate of hypertension among type 2 diabetic patients in Hosanna Nigist Ellen Mohammed Memorial Hospital was high. More than half of the study subjects in Nigist Ellen Mohamed Memorial Hospital hospital were hypertensive.