Acute respiratory tract infections are the most common cause of illness and death among children in the world. In India, in the year 2001, outpatient attendance attributed to acute respiratory infections was as high as 20 percent to 40 percent of all the clients and 12 percent to 35 percent of in patients.

Aim of The Study: The main aim of study assess the knowledge regarding Acute Respiratory Infections and its prevention among mothers of under five in rural community.

Methodology: In view of the nature of the problem selected for the study and objective to be accomplish Non-Experimental Descriptive design was considered. Sample select for the study was 50 mothers. Simple random sampling technique was used.

Result: Result showed Majority of the mothers of under-five children had low knowledge (70%) and 15 mothers had average knowledge (30%) and none of them had high knowledge during pre-test about ARI. The mean knowledge score regarding Acute Respiratory Infections and its prevention among mothers of under five in rural community 12.54±2.94. There was no significant association found between socio-demographic variables with knowledge regarding acute respiratory tract infections among mothers of under-five children.

Conclusion: The study concluded that there was majority of mothers having low level of knowledge regarding Acute Respiratory Infections and its prevention.