Introduction: Primary suture is the most commonly used emergency surgery procedure for peptic ulcer perforation (PUP). The aim of this study was to evaluate factors affecting mortality in patients who underwent primary suture for PUP. Methods: In total, 103 patients underwent primary suture for PUP between September 2009 and December 2016. Patient demographics, comorbidities, the time interval between symptom onset and hospital admission, the length of hospital stay, and morbidity and mortality data were retrospectively collected. Results: The median age of the patients was 63 years (min: 22, max: 99 years) and 74.8% were male. In all, 45 patients had at least 1 comorbidity. The median time interval between symptom onset and hospital admission was 1 day (min: 1, max: 10 days). The mortality rate was 10.7%. Non-surviving patients were older, more frequently presented with shock, and more often had postoperative pneumonia, compared with survivors. Older age (Odds ratio [OR]: 1.22; p=0.0015) and postoperative pneumonia (OR: 84.2; p=0.0031) were independent risk factors associated with increased mortality. Discussion and Conclusion: Advanced age and postoperative pneumonia were the factors associated with an increased risk of mortality in patients who underwent primary suture for PUP.