This study aimed at investigating the nexus between household food security and nutrition statusrnof children under five in Gelan town, Oromia region, Ethiopia. A total of 100 mothers of underrnfive children were selected using stratified random sampling technique from three kebeles. Datarnwere collected using structured questionnaires and anthropometry. Household food insecurityrnaccess scale (HFIAS) and household diatery diversity score (HDDS) were used to investigaternfood security status of households. Likewise, anthropometric indices height for age (HFA),rnweight for height (WFH) and weight for age (WFA) were used to determine the nutritional statusrnof under five children. Descriptive and inferential statistics as well as multivariable logisticrnregression model were used to determine the association between household food security andrnnutritional status of under- five children in the study area. The result indicated 8.2% ofrnhouseholds were food secure of which 29.05 % were severely food insecure while 27.86 % andrn34.87% mild and moderately food insecure respectively. Majority of the households havernmedium diatery diversity score (55%) while 24 % and 21 %of the households have high and lowrndietary diversity score, respectively. Underweight prevalence was found to be 13% in the kebelesrnamong under-five children. Similarly, wasting prevalence was 4% and stunting prevalence wasrn7% in the kebeles among under-five children. Household dietary diversity, monthly income andrnhouseholdâ€™s food security access scale showed positive relationship with normal underweight,rnnormal stunt and normal wasting. Whereas, mother's occupation, farm land area, home garden,rneducation level of household head, breast feed, marital status, living home owner and householdrnhead sex showed negative relationship with normal underweight, normal stunt and normalrnwasting among study area. Monthly income shows positive relation with all the nutritional statusrnindicators. It is recommended that there is a need for communities to stand-in activities thatrnincrease household income, which will in turn improve expenditure on child care, andrnimplications child nutritional status for better food and nutritional security in Gelan townrnselected kebeles.