Background: Despite the availability offree and effective treatment for Pulmonary tuberculosis,rnthe success rate is not asthe expected due to different factors which imposes a major challengernparticularly for developing countries. rnObjectives: To determine treatment outcomes andassociatedfactors among patients withrnpulmonary TB in selected health centers of Addis Ababa Ethiopia in 2020. rnMethodology: an institution based three years retrospective study was conducted on therndocuments of pulmonary tuberculosis patients who were treated fromJanuary 1rn 2017-rnDecember 31rnstrn 2019 in selected health centers of Addis Ababa. A structured check list wasusedrnto gather data from patientsâ€™ medical records.Data was entered and cleaned using E pi infornversion 3.5.1 and exported to statistical package for social sciences (SPSS) version 24, computerrnsoftware was used for analysis. Binary and multivariable logistic regression analyses werernemployed to assess factors that are associated with treatment outcomes. rnResults: out of the total 633 patients, 361 (56.7%) were males and 275(43.23%) were females.rnThe mean age and standard deviation of the participants was 37.49Â± 12.99. The overall treatmentrnsuccess rate was found to be 86.4%. The odds of successful treatment outcome were higherrnamong new cases, HIV negatives, no history of smoking, and those patients who have treatmentrnsupporters. rnConclusions: the proportions of patients who are successfully treated are below the averagernwhich is set by WHO. Strategies to improve the treatment outcomes of patients with pulmonaryrnTB should be improved especially for those patients who are at high risk of developingrnunsuccessful treatment outcomes. rn rnst