Background: Bronco pneumonia is an illness usually caused by infection, in which the lungs become inflamed and congested, reducing oxygen exchange and leading to cough and breathlessness. It affects individuals of all ages, but occurs most frequently in children. Among children pneumonia is the most common cause of death worldwide. Every year 1.9 million children under five years of age die from bronco pneumonia Indeed, it is the leading cause of child death in the world. Objectives: (1) to assess the existing knowledge of under five mothers on bronco pneumonia.(2) To study the effectiveness of  knowledge of under five mothers after Structured teaching programme on bronco pneumonia.(3) To compare pretest and post test knowledge of  under five mothers. Materials and methods: research design is pre experimental design was used in this study. Data collected from 50 mothers of under five children

In selected pediatric hospital at Guntur district. Purposive sampling was used for selecting the sample in the investigator developed structured questionnaire on bronco pneumonia used for data collection