Introduction:-Stunting remains a problem of greater magnitude than underweight or wasting, and it morernaccurately reflects nutritional deficiencies and illness that occur during the most critical periods for growthrnand development in early life. Stunting in early childhood results in diminished cognitive and physicalrndevelopment, which puts children at a disadvantage for the rest of their lives. Most studies indicated thatrnstunting is associated with low socio-economic status, low educational level of parents, poor water supplyrnand sanitation, and high infectious diseases burden. Stunting is one of the most important public healthrnproblems in Ethiopia.rnObjectives: - The study was aimed to assess the magnitude of stunting and associated factors among underrnfive children in Mizan-Aman town, Bench Maji Zone, SNNPR Region, Ethiopia.rnMethods: - A community based cross-sectional study was conducted by simple random sampling techniquernwith sample size of 734 6-59months children. Interviewer administered structured questionnaires was usedrnto collect data. The data was entered using EPI INFO version 7.0.9.34 2014 and analysis was done by SPSSrnversion 22 and ENA for SMART, 2011 software. Bivariate and multivariate logistic regression analysisrnwas used. The variables which had significant association were identified on the bases of P value.≤0.05 andrn95%CIrnResult: - In the study, 35.4% (34.6%-36.3%; 95% C.I) 6-59 month children were stunted. Of the totalrnnumber of stunted children, 138 (53.1%) were male children. Children within age group 24-35 monthsrn(AOR=2 .29:95%Cl: 1 .10, 4.82), children whose mothers had no education (AOR=5.38; 95%CI: 2.27,rn12.77), low income households (AOR=3.92; 95%Cl: 2.546.06), children who had small size at birthrn(AOR=2.1O; 95%Cl: 1.13, 3.93), having 4 and above birth order (AOR=2.32; 95%Cl: 1.28, 4.21),rnchildren who had breast feed for more than 24 months long (AOR=2.49; 95%Cl: 1.03, 6.00) and mothersrnnot used cup to feed children (AOR=2.08; 95%CI1 05, 4.15) were more likely to be stunted.rnConclusion: - Stunting was a highly prevalent problem ¡n the study area and child’s age. Mother’srneducation, household income, birth order, Size at birth, duration of breast feeding and cup feeding werernfound to be associated factors of stunting. There is need for linking nutrition interventions and socialrnprotection programm in Mizan-Aman town.rnKey Words: Stunting, Anthropometric index