Objective: This study aimed to assess uncontrolled blood pressure and contributing factors among patients with hypertension. Methods: Hospital-based cross-sectional study was conducted from January to April 2021 at Bedele General Hospital. Data were collected using the semi-structured questionnaire. All patients with hypertension were included using consecutive sampling technique unless ineligible. EpiData 4.4.2 was used for data entry, and SPSS 24.0 was employed for analysis. Binary logistic regression analysis was performed to identify factors associated with uncontrolled blood pressure. Results: A total of 219 patients with hypertension were included in the study. About 60.3% of participants were male. The mean age of the study participants was 48.54 ± 12.93 years. The prevalence of uncontrolled blood pressure among the study participants was 56.2%. The factors significantly associated with uncontrolled blood pressure were age >60 years (adjusted prevalence ratio = 4.42; 95% confidence interval = (1.71, 11.46); p = 0.002) and the presence of comorbidity (adjusted prevalence ratio = 2.16; 95% confidence interval = (1.22, 3.82); p = 0.008). Conclusion: More than half of the study participants had uncontrolled blood pressure. Older age and comorbidity were the predictors of uncontrolled blood pressure. Attaining controlled blood pressure is important to avoid consequences of high blood pressure. So, healthcare provider should focus on achieving target blood pressure goal.