Background: Diarrhea is considered as one of the most common illness and one of the major causes of infants & children mortality in developing countries. A reduction in diarrhea-related mortality may be possible by the early identification of high risk subjects and targeting them for intensive intervention. Aims: This study was done to collect important information about the common microbial agents that cause bacterial gastroenteritis in Kirkuk pediatric hospital. Patients and methods: This is a retrospective study reviewed all patients who were admitted to Kirkuk pediatric hospital from 1st of January 2008 to 31st of December 2010 whom were complain from frequent loose bowel motion. Data regarding gestational age, gender, causative microorganisms, date of admission, date of discharge and outcome were collected and analyzed. Results: The results of this study showed that among 301 cases who were admitted to the hospital during this period, 184 cases (61.13%) were proved to have bacterial gastroenteritis by stool culture. Escherichia coli was the most common bacterial pathogen found in 171 cases (92.93%). Most patients who admitted were infants 141 case (76.63%) while older children were only 43 cases (23.67%). The study showed that higher cases were recorded in the urban area (58.69%) than rural areas (41.31%). Majority of cases (65.76%) included in the study were improved, while mortality rate recorded in the hospital was (0.82%). Conclusion: Significant number of cases had bacterial gastroenteritis. ; Escherichia coli was the most common causative bacterial infection in children. Infancy was the most common pediatric age group which was affected.