Background: The burden of occupational injury in most developing countries includingrnEthiopia is becoming a public health problem. Therefore, information that shows the magnitudernand predictors of occupational injury in most risky work places in Ethiopia such as metalrnprocessing and working industries is indispensable to inform proper intervention programs tornhave healthy workforce and sound economic development.rnObjective: This study is intended to assess the magnitude and factors affecting occupationalrninjuries among workers engaged in large scale metal manufacturing industries in Addis Ababa.rnMethod: Institutional cross sectional study was conducted in Addis Ababa from February tornMarch 2010. 50% of large scale metal manufacturing industries were selected by simple randomrnsampling after stratification. Then, calculated sample size was allocated for each industry byrnPPS. And then, Study subjects were stratified by working sections and those who were directlyrnengaged in the work were selected from each stratum by simple random sampling after preparingrna frame from payroll of those industries. Structured questionnaire was designed to collectrninformation on outcome variables and factors. Observational checklist and in-depth interviewrnwith key informants was held to triangulate the information with quantitative findings.rnResult: The overall prevalence of occupational injury was 489 per 1000 exposed workers perrnyear. 119(29.4%) of injured workers were hospitalized or stayed at home bed with 98(82.4%)rnfor 24 or more working hours and one death was reported in 12 months. Sex of workersrn[AOR:3.32, 95%CI: (1.88,5.85)],Safety and health supervision [AOR: 1.60,95%CI:(1.03,2.60)],rnHours worked per week [AOR: 2.37,(95%CI:(1.55,3.61)], Cigarette smoking [AOR:rn3.36,95%CI: (1.73,6.50) ] and presence of functional danger signs/ posts [AOR: 2.65,(95%CI:rn(1.67,4.19)] were significantly associated factors with magnitude of occupational injury.rnConclusion and Recommendation: The burden of occupational injury in metal manufacturingrnindustry is really significant public health problem. So continues health and safety information,rnbasic occupational health services and additional cohort study for factors should be undertaken.rnKey words: occupational injury, large scale metal manufacturing industries