Back ground: Low birth weight is a public health problem in almost all countries of the world ofrnwhich Ethiopia is one. The empirical literature provides mixed results on the relationship betweenrnmany of these factors and LBW. Some of the variables that are found to be predicator of LBW inrnone study may not necessarily be a risk factor in another study.rnObjective: The main objective of this study is to assess the magnitude and factors associated withrnlow birth weight at public hospitals of Addis Ababa from August 2014 to June 2015.rnMethods: Hospital based cross-sectional study was conducted in Addis Ababa. The study wasrnconducted among three selected hospitals. A total of 457 samples were drown proportionally fromrnthe selected hospitals. Pre tested structured interviewer administered questionnaire was used. Therncollected data was cleaned, coded, and entered into EPI INFO and then exported to SPSS versionrn21.0 for analysis.rnResult: The magnitude of low birth weight was 8.8%. Low birth weight was more likely associatedrnwith timing of ANC visit (AOR=7.407, 95% CI=1.148, 47.794), taking extra meal duringrnpregnancy (AOR=0.249, 95%CI=0.064, 0.960), type of pregnancy (AOR=0.302, 95% CI=0.094,rn0.972) and iron/folic acid supplementation (AOR=0.30295%CI=0.092, 0.972).rnConclusion and recommendation: Low birth weight was substantial and strengthening the publicrnhealth intervention that put into consideration the factors identified here are essential.rnKey word: Low birth weight, maternal risk factors