Background: - Globally, traumatic brain injury is a substantial cause of morbidity andrnmortality across all age groups, with a disproportionately greater burden borne by low- andrnmiddle-income countries. Objective: -The aim was to assess the outcomes and predictorsrnof traumatic brain injury among traumatic brain injury patients. Method: - A two yearsrnretrospective cross-sectional study design was employed among 371 participants in the tworntrauma hospitals found in Addis Ababa between February 25 and April 15 2019.rnParticipants with traumatic brain injury who visited the two trauma hospitals in the cityrn(AaBET and ALERT hospitals) from January 01, 2017 to December 31, 2018 werernincluded. An adopted and modified semi-structured pre-tested data extraction tool wasrnused to gather data. Purposive sampling was used to select the two trauma centers and datarnwas collected using simple random sampling technique. Data was cleaned manually, codedrnand entered into EPIâ€“data manager version 4.4 and exported to a SPSS version 21.0 forrnanalysis. Binary and multiple logistic regressions were computed to evaluate associationrnbetween dependent and independent variables. Level of significance was determined usingrn95% confidence interval and p-value less than 0.05.Result: - results of this study showedrn36% unfavorable and 64% favorable outcomes. Age, time of arrival, severity of injury,rnpapillary reactivity oxygen saturation was predictors of outcomes of traumatic brain injury.rnThose patients with traumatic brain injury aged between 18 and 24 were less likely to havernunfavorable outcome AOR= 0.067[0.007, 0.622], Those patients with traumatic brainrninjury who arrived to the hospitals between 4 and 24 hours and greater than 24 hours werernmore likely to have unfavorable outcome AOR=2.857[1.150,7.099], andrnAOR=7.623[2.594,8.915] respectively. Those patients with a severe AOR=5.224[2.562,rn8.915] and moderate AOR 2.851[1.298, 6.262] type of traumatic brain injury, patients whornwere reported to have anisorcia papillary reflex AOR=3.941[1.766, 5.793] and hypoxiarnAOR 3.490[1.845, 6.603] were more likely to have unfavorable outcome. Conclusion: -rnThis study showed that 36% of traumatic injury patients have unfavorable outcome. Age,rntime of arrival, oxygen saturation, severity of injury and pupillary reactivity are associatedrnwith patient outcomes of traumatic brain injury. Improved time of arrival, and closernmonitoring of oxygen levels is recommended to substantiate patient outcomes.