Objective: In our study, it was aimed to investigate the factors affecting mortality in patients hospitalized in intensivecare unit with the diagnosis of community-acquired pneumonia (CAP). Material and Methods: 50 patients with severe pneumonia who were admitted to either Pulmonary and EmergencyDepartment and accepted to our intensive care unit with CAP between January 2014 and January 2017 were recruited.Demographic features, comorbid diseases, laboratory findings on the 1st, 4th, and 7th days of hospitalization, thestatus of invasive mechanical ventilation (IMV), duration of hospitalization were recorded and their relationship withmortality was examined. Results: Fifty patients (mean age: 78 ± 13 years, 40% females) were included in the study. The mean age of the fatalcases was found to be higher (p=0.023). Systolic blood pressure was found to be lower in deads (p= 0.035). In deadpatients, plasma total protein levels was significantly lower (p= 0.022). Plasma urea levels (p <0.05), fasting bloodglucose levels (p= 0.035), CRP levels (p= 0.011) were significantly higher at the fourth day of hospitalization in deadcases. Plasma albumin levels measured at the seventh day of admission was lower in dead patients (p= 0.005).Comparison between the first and the fourth day of admission revealed that the reduction in the platelet (PLT) counts(p= 0.001), total protein levels (p= 0.001) and albumin levels (p= 0.001) and also the increase in the LDH levels (p=0.022) and in the pCO2 measurements (p= 0.029) were found to be statistically significant in terms of mortality duringfollow up. Conclusion: Advanced age, lower systolic blood pressure, lower serum total protein and albumin levels, elevatedLDH levels, poor reduction in CRP and WBC despite treatment, an increase in pCO2 measurements were consideredto be related with mortality in community-acquired pneumonia patients followed up in intensive care unit.