Background: Acute lower respiratory tract infections in developing countries cause considerablernmorbidity, hospitalization and mortality in children aged under five years. In Ethiopia acute respiratoryrninfection is the leading causes of under-five mortality which accounts for 18% of total death among underrnfive children.rnObjective:To assess risk factors associated with acute lower respiratory infection among under fivernchildren in Yeka sub city, Addis Abeba, Ethiopia.rnMethods: community based cross-sectional study was conducted with a sample size of 447. Data wasrncollected by interview, entered to EPI data version 3.1, and was exported to SPSS version 22 for analysis.rnDescriptive statistics using frequencies, proportion and tables were used to present the study results.rnBinary logistic regression analysis was employed to see association between acute lower respiratoryrninfection and different risk factors. To evaluate the association and adjusted odds ratio with 95%rnconfidence interval were computed.rnResults: The prevalence of acute lower respiratory tract infection was 4.6%. Evidence from this studyrnalso showed that house hold with window (AOR=0.2, 95% CI: 0.1-0.6, p-value=0.002) and family size ofrnless than five children (AOR=0.1, 95% CI: 0.01-0.6, p-value=0.01) were preventive risk factors.rnConclusions and recommendations: The prevalence of acute lower respiratory infection was low. Thisrnstudy has demonstrated that the preventive factors for acute lower respiratory infection were maternalrneducation to primary or secondary level, household with window and less than five children in thernhousehold. These risk factors can be modified by encouraging and increasing community awareness forrnchild spacing and increase and promote female education.