Background: Globally hypertension is one of major public health problem affecting 972rnmillion people. The prevalence of hypertension in Ethiopia is estimated to be 16% in 2015.rnBut vast majority (76.6%) of hypertension patients in Ethiopia never measured their bloodrnpressure. Furthermore, large number of patients visited traditional healers. rnObjectives: The study examined the magnitude and associated factors of raised bloodrnpressure among previously undiagnosed adult outpatient attendants in Tirunesh BeijingrnGeneral Hospital, 2020. rnMethods: The study employed an institution-based cross-sectional study design. A total ofrn408 study participants were included and selected by using systematic random samplingrntechnique. Data were collected by using a pretested structured questionnaire. Descriptivernstatistics analyses such as frequency and cross tabulation were calculated to measure thernmagnitude for selected variables versus the magnitude of raised blood pressure. Binaryrnlogistics regression was used to examine the possible risk factors for raised blood pressurernand risk factors with p-value < 0.2 were included in the multivariable logistic regressionrnmodel. Statistical significance was determined at P-value < 0.05. The data was processed inrnEpi Data v3.1 and analyzed in SPSS v26. rnResults: The respondents age ranged from 18 to 80 years and nearly half (49%) of them werernmale. The mean systolic and diastolic blood pressures were 125.61 millimeters of Mercuryrn(mmHg) (14.25 SD) and 76.77 mmHg (8.82 SD), respectively. The prevalence of raisedrnblood pressure was 18.6%, 95% CI (15, 22.3). Age >50 years (AOR=7.7, 95% CI:2.8,21.4),rnage 30 to 49 (AOR=3.3, 95% CI: 1.4, 7.7), smoking (AOR=6.1, 95% CI:2.6-14.3), alcoholrnconsumption (AOR=2.4, 95% CI:1.3-4.3), salt intake (AOR=2.1, 95% CI: 1.1-3.9), and bodyrnmass index (BMI) (AOR=2.5, 95% CI:1.2,5.3) were statistically significant risk factors forrnraised blood pressure in adults. rnConclusion: This study indicated that raised blood pressure was a major health burden. Thernstudy identified risk factors for raised blood pressure in adults, and most are modifiable.rnHence, stakeholders may use the finding to develop preventive and control strategies torndecrease the burden of raised blood pressure.