World Health Organization (WHO) has defined diarrhoea as “the passage of three or more loose or liquid stools per day , or more frequently than is normal for the individual”. Diarrhoea is the fifth leading cause of death worldwide and is the leading cause for under five child mortality in developing countries including India. Millennium Developmental Goal (MDG) has specially focused on decreasing the mortality from diarrhoea in under five children. In India mortality of under five children due to diarrhoeal diseases is 18% as per WHO report (2006). Mothers basic knowledge about diarrhoea depends on various factors such as educational status, prior experience of managing the disease. The availability of ORS can reduce the mortality and morbidity due to diarrhoea but due to lack of knowledge among mothers and their attitude towards its use, diarrhoea is still a common problem. The mortality of children due to diarrhoea can be reduced when there is better knowledge and practice among mothers. This study is aimed to assess the knowledge and practice on the management of diarrhoea among mothers of under five children.