Background: : Pneumonia is an infection of the lungs and lower respiratory system that is the most common cause of death in children under age 5 years old in sub-Saharan Africa. The mortality of pneumonia in children around 18% of mortality rate in under 5 years old, of which 3% occur in newborns. Objective: : To study management outcome of pneumonia among children under 5 years at pediatric ward, Khammouane Hospital, Vientiane Hospital and Paklay Community Hospital, Lao PDR Methodology: : This was retrospective study. Data collection by using questionnaire form by copy data from document of patient. The data entered by Epi-data and analysis by SPSS program. Result: : A total of 173 participants, more than half of the patients are male (55.5%), aged between 1-3 years old (46.8%) and most of them was Lao-Loum group (74.6%). Management outcome almost of all had better/well (93.6%), not better/not well (5.8%) and there is one case of death during treatment (0.6%). Analysis of the association between the management outcome found that fever were associated significant with management outcome (p-value: 0.033), the duration of the fever (p-value: 0.007) and eat-drink were associated significant with management outcome (p-value <0.001). Also, those who had a treatment before admitted to hospital were association significant with management outcome (98.0%, p-value: 0.002). For clinical examination were association significant with management outcome such as mental status (p-vale <0.001), breathing rate (p-value: 0.048) and fluctuating nasal symptoms had management outcome (p-value <0.001). Besides, wheezing symptoms, breathing characteristics, chest-rib sounds and abnormal sounds at the lung point were associated statistically significant with management outcome of pneumonia (p-value <0.05). Conclusion: The outcome of pneumonia among children under 5 years old, most of all patients had better/well. There are only 10 cases where the symptoms did not better and 1 case died. Most of the treatment period is 4-7 days and mild complication in during hospitalization. There should be health education about the symptoms and dangers of the disease to the child's parents to bring the child to the hospital urgently.