Abstract : <p>Household food insecurity is highly prevalent in developing countries but clearly not associated with poor health and nutrition outcomes of children in many countries. Children in food-insecure households were more malnourished and faces higher rate of hospitalization, iron deficiency anemia, and more frequent stomach aches and headaches than in food-secure households. Some researches shows household food insecurity was associated with underweight, wasting and stunting that mean malnutrition among children. This cross-sectional study aimed to find out the extent of association between household food insecurity and sociodemographic characteristics of under 5 children in a coastal area of Bangladesh. This household based cross-sectional study was conducted among 453 under five children and their respective mother/ head of household residing in 11 villages of 5 union parishad of Ashasuni upazill of Satkhira district of Bangladesh to find out the extent of association between household food insecurity and sociodemographic characteristics of them. Children getting consent from their parents were inducted as study participants. Semi-structured questionnaire was used to collect data on the food security and socio-demographic variables. Among 453 participants about 54% (243/453) people were food insecure and among them 32% (145/243) were mildly food insecure followed by moderate food insecure (20%, 91/243) and severe food insecure (2%, 7/243). About 49.0% (222) were male child and 51.0% (231) were female child. The age of respondent&rsquo;s child was between 12 to 57 month and the mean age was 29.77&plusmn;14.219 month and the youngest child was 12 month of age while the oldest was 57 month of age. Sociodemographic and socioeconomic factors may be a key contributor of food insecurity status. Paternal responsibility towards family, his occupation, overall earning capacity of family, educational status of children and their housing type may contribute a significant role in household food insecurity level. Improvement of these factors may improve overall security status.</p>