<p class="abstract"><strong>Background:</strong> Childhood pneumonia is a serious infection and the single largest infectious cause of death in children. The study aims to evaluate knowledge and perception among mothers on pneumonia diseases among the children.</p><p class="abstract"><strong>Methods:</strong> A hospital based study was conducted to describe socio-demographic factors of mothers, their knowledge and perception of pneumonia disease. Study was conducted at Sheikh Hasina Medical College Hospital in Tangail from June to July 2018 by interviewing 215 mothers of children under-ten years attending a pediatric clinic by using structured questionnaire. </p><p class="abstract"><strong>Results:</strong> The parents were predominantly primary school graduates (70.7%). The majority of the father worked as daily laborer (61.9%) with about 5-10K BDT of family income per month. Around 88.4% of the mothers had fair knowledge about pneumonia. For children treatment, 90.2% parents consulted with qualified doctor, about 10% utilized self-medication. About 44.7% children were suffered from fever during pneumonia, about 42.8% was experienced shortness of breath, and about 28.4% experienced of wheezing. About 90.2% parents believed that the indoor temperature, humidity and air movement has effect on pneumonia. About 92.6% cares of reducing indoor smoke and dust, about 40.5% families have a smoker. The lack of knowledge among mothers about simple signs and symptoms of pneumonia and also about its causes and factors related with it has become important findings of this study.</p><p class="abstract"><strong>Conclusions:</strong> Community based public health education and training for health providers at all levels have to be provided about correct and applicable prevention and assessments of pneumonia.</p>