Diarrhea is the second most common cause of morbidity and mortality among the under–five children. As a primary caregiver, the mother’s knowledge, perception and management skills are of importance. A cross–sectional study was undertaken with the objectives to determine the knowledge, attitude and practice regarding diarrheal diseases, its prevention and management in mothers’ of under–five children, in the field practice area of the Urban Health and Training Centre of Kalinga Institute of Medical Sciences, Bhubaneswar; from 1^st September to 1^st November, 2016. A sample size of 125 mothers with children belonging to under–five age group, with an assumption that the proportion of awareness on diarrhoeal illness among the mothers’ population as 50%.  94% mothers defined diarrhoea appropriately. 56% of them were aware about modes of spread. Most(96%) mothers believed in and 58% practiced  hand washing with soap post–defecation to prevent diarrhoea. 40% of them recognized critical signs of dehydration, 66.4%the importance of increased fluid requirement and 42.4% practiced it for management of diarrhoea. Though 97.6 % mothers used ORS, only 42.4% considered it as the mainstay treatment of diarrhoea. Thus, we conclude that though the community knowledge, attitude and practices on diarrhoeal illness and its prevention is marginally satisfactory, the poor knowledge regarding signs of dehydration and relevance of ORS as primary management component is a matter of concern. Proper knowledge can ensure decrease in the childhood morbidities and mortalities.