Background: Immunization is amongst the most cost effective public health interventions for reducing childhood morbidity and mortality. However globally 9 million deaths of children occur as a result of vaccine-preventable disease in which 4.4 million are from sub-Saharan region. Therefore, this study aimed to assess barriers for complete vaccination coverage among under five years children in Mogadishu, Somalia. Methods: A community based Cross-sectional study was conducted in between April to July, 2019 in Mogadishu-Somalia. Two-stage cluster sampling with systematic random sampling was used to select a sample of 820 households. Data was collected through structured, interviewer administrator questionnaire. In case more eligible children found at single selected household, one child was randomly selected and the information related to immunization was interviewed from his/her caregiver. Results: the overall, fully vaccinated under five years children was found to be 45.2%. Immunization was found to be increased by being a younger caregiver (β = -0.019, P-value=0.042), being married caregiver, being Father with Secondary & above education (AOR=1.755, 95% CI=1.161-2.655, P-value =0.008), being a young child (β = -0.018, P-value=0.011), being children from birth order of fifth & above (AOR=1.539, 95% CI=1.011-2.343, P-value=0.044), Married caregiver (AOR=0.244, 95% CI= 0.063-0.94, P-value=0.041), increased Household monthly family income= (β = 0.003, P-value=0.000), Availability of vaccine at the time of visit (AOR =6.147, 95% CI=1.943-19.441, P-value=0.002), Cost affordability of vaccine =( AOR =1.951, 95% CI=1.238-3.076, P-value=0.004), Being born at health facility (AOR =1.517, 95% CI=1.104-2.086, P-value=0.010), having good Knowledge on immunization (AOR =1.125, 95% CI=1.070-1.181, P-value=0.001), having good Practice on immunization (AOR =2.756, 95% CI=2.233-3.402, P-value=0.001) and having good Perception on vaccine (AOR =4.976, 95% CI=2.183-11.340, P-value =0.001). Conclusion: The result of this study has revealed that the proportion of fully immunized under five children in Mogadishu is very low. Steps to promote Health education and vaccine availability should be lounged.

Keywords: Barriers, full Immunization, Coverage