Pneumonia results in more than 500,000 hospital admissions annually in adults and ranks as the sixth leading cause of death in United States. The problem is much greater in developing countries where pneumonia is the most common cause of hospital attendance in adults. Physicians need reliable data on the relative prevalence of different etiological agents in the patients' area of residence, in addition to the clinical, laboratory and radiological findings in order to initiate antibiotic treatment empirically. The relative frequency of etiological agents varies among different geographical areas. Hence based on these findings the present study was planned for Clinical Association of Bacteriological, Radiological and Clinical Findings in Children Suffered from Pneumonia. The present study was planned in Department of Paediatrics, Government Medical College, Bettiah, West Champaran, Bihar. Total 50 Children in the aged 1 to 5 years with clinical signs suggestive of pneumonia were included in the study, as per WHO guidelines. A detailed history of the relevant symptoms such as fever, cough, rapid breathing, refusal of feeds, noisy breathing and bluish discolouration were considered. Based on WHO ARI criteria, children with tachypnea were considered. The data generated from the present study concludes that Routine haematological investigations and blood culture will not give much information regarding severity or etiology of illness. Chest X-ray is valuable aid in the diagnosis of pneumonia in children. Also clinical diagnosis by WHO ARI criteria are very sensitive and can be applied to hospitalized children. Application of molecular diagnostic techniques has the potential to lead to more targeted therapy in the face of increasing antibiotic resistance. The advent of conjugate vaccines against Bacteria- Pneumococcus, H. Influenza, and Viruses- Influenza could help reduce burden of the disease in the community.