Background: Perforated peptic ulcer disease is a surgical emergency with a high morbidity and mortality. The socio-demographic characteristic and the factors associated with morbidity and mortality seems to differ between the developed and developing world. This is the first a prospective cohort study in Ethiopia designed to analyze pattern and outcome of patients with perforated peptic ulcer disease in four teaching hospitals affiliated with SOM, CHS of Addis Ababa University. Method: This is a prospective cohort study of patients operated for perforated peptic ulcer disease from June 1, 2018 to May 31, 2019 in four teaching hospital affiliated to department of surgery of SOM, CHS of Addis Ababa university. Result: A total of 97 patients were operated in a year. 86.6% were males with a male to female ratio of 6.5:1. The age group 21-30 were most affected constituting 42.3% of all patients. Mean age is 31.9, Median of 27, age ranges from 16 to 76. Alcohol use (45.4%) and previous history of ulcer disease (75.3%) were the most prevalent risk factors.33% were smokers. Abdominal was present in all and most presented within 48 h (79.4%). 85.6% had pneumo = peritoneum in an x-ray at presentation. Size of the perforation is 10 mm or less in 81.3%. 91(93.8%) had anterior first part duodenum perforation. Repair with pedicled omental patch was done in 65 (67.1%) patients. Age, duration of presentation, hypotension at presentation, size of perforation, degree of peritoneal contamination were found to be the significant factors for morbidity and mortality. Major morbidities were observed in 16 (16.5%) and mortality occurred in 3 (3.1%) patients. Conclusion: Perforation of peptic ulcer disease here occurs in the young. Age, duration of presentation, hypotension at presentation, size of perforation, degree of peritoneal contamination were found to be the significant factors for morbidity and mortality. Morbidity and mortality rate of 16.5 and 3.1% observed here are quite acceptable.