Objective: The aim of this study is to determine the prevalence of pneumonia associated with measles among children and infants. Study Design: Cross-sectional Place and Duration: Pediatrics department of Lady Reading Hospital, Peshawar and Sharif Medical and Dental College, Lahore for six months duration from February 2020 to July 2020. Methods: Total 150 patients i.e children and infants of both genders were included in this study. Children were aged <5years of age. Patients’ detailed demographics height and weight were recorded after taking informed written consent from the authorities. Patients’ diagnosed measles were presented. Symptoms and frequency of pneumonia among all patients were assessed. Complete data was analyzed by SPSS 22.0 version. Results: There were 90 (60%) children and 60 (40%) infants. Among 150 patients, 100 (66.7%) were males and 50 (33.3%) were females. 70 (46.7%) cases had birth weight > 3kg. 30 (20%) patients had high socioeconomic status, 50 (33.3%) had middle and 70 (46.6%) cases had poor. 85 (56.7%) patients had rural residency. According to severity of measles, 35 (23.3%) had mild,45 (30%) cases had moderate and severity was among 70 (46.7%) patients. Prevalence of pneumonia was found among 95 (63.3%) cases. 40 (26.75) cases had measles vaccination. Conclusion: We concluded in this study that prevalence of pneumonia among children of measles were significantly high. It was due to less number of vaccination status with poor socio economic status among patients. It can be controlled by providing awareness of vaccination to the parents of children. Keywords: Pneumonia, Measles, Children, Infants, Prevalence