World Clinics in Pulmonary and Critical Care Medicine dedicated to Pneumonia. This issue highlights the various aspects of pneumonia which will benefit both the students and teachers interested in pulmonary medicine. This issue includes all topics related to pneumonia with an international perspective. Both international and national authors have contributed various topics and focus is also given to discuss tropical infections. This issue extensively discusses bacterial, fungal, viral, and parasitic pneumonia covering the epidemiology, risk factors, clinical features, and management. Epidemic or pandemic nature of illnesses is presented by experts in the concerned fields such as influenza pneumonia and readers will find it interesting to get updated information on such a common disease. One topic is dedicated to pediatric pneumonia covering its etiology, risk factors, clinical presentation, diagnosis, treatment, and outcome. This is particularly important because pediatric pneumonia differs from adult pneumonia in all these aspects. Newer diagnostic methods including molecular methods are exhaustively discussed.