This paper examines the impact of healthcare delivery utilization on under-5 mortality in Myanmar. Reducing under-5 child mortality is the first target under the Sustainable Development Goal (SDG) Goal 3. In 2015, Myanmar registered anunder-5 mortality rate that was higher than the regional average. According to the World Health Statistics, Myanmar is a low-income country in the Southeastern Asian with high maternal deaths. This paper investigates the impact of the utilization of health care delivery on under-5 mortalities among states and region. In practice, all health factors are very important which relationships between utilization of health care delivery and under-5 mortalities. These results give strong evidence of the success of the main findings. In spite of all variables were not statistically significant with the outcome variable were included in the multivariate analysis. The risk of child mortality was significantly higher for children of 4-5 birth order number (OR: 1.85; 95% CI: 1.01-3.38; p=0.048) and above six or more birth order number (OR: 2.11; 95% CI: 1.04-4.28; p=0.039) respectively. Children who were treated by seeking health assistance that had reduced risk (OR: 0.06; 95% CI: 0.01-0.29; p=0.000) of childhood death compared with children who were no assistance of seeking health when children were no response. The risk of child mortality was significantly reduced for children whose mothers were accessible antenatal care facilities such as government hospital, private hospital, and mobile clinic (OR: 0.39; 95% CI: 1.06 -5.15; p=0.000). The paper efforts the relationship between utilization of health care delivery and under-5 child mortality by investigating of the socio-economic and demographic factors from first time Myanmar DHS (2015DHS ( -2016. The main results highlighted the determinant of the main factors on under-5 child mortality among states and regions.