Background: - Unintended pregnancies are major concern in developing countries including Ethiopia.rnFemale university students face unintended pregnancies because most of them are sexually active andrnexposed to unprotected sporadic premarital sexual intercourse. Contraceptives are being increasingly usedrnby unmarried young women to prevent unintended pregnancies following unprotected sexual intercourse.rnHowever, little is known about Contraception use among female students at higher education in Ethiopia.rnObjectives: -The aim of this study was to assess the prevalence and factor that affect modernrncontraceptive use among female undergraduate students in Addis Ababa University.rnMethods: - Institution based cross sectional descriptive study involving 633 undergraduate femalernstudents from Addis Ababa University was done. Study participants were selected using systematic randomrnsampling technique. The data was entered and analysis in to SPSS version20. Different forms of analysisrnlike descriptive statistics, cross tabulation and logistic regression were applied to present the results.rnRecoding of data was also done for some variables to fit them in to binary logistic regression model.rnAdequate time was spent on the analysis to ensure quality.rnResult:- over all 42.3% of the students were sexually active. Of the total sexually active respondentsrn95.5% of them use contraception and the remaining 7.5% of the students never use contraception. Half ofrnsexually active students practice sext before the age of 18 and 57.8% of sexually active students practicernunsafe sexual behavior. The age of 20-24 years of age were 23% [OR=3.375 (1.008, 11.299)] more likelyrnto use contraception and students those who were not practice induced abortion 68% [OR=0.320(0.042,rn2.459)] more likely to use contraception. This shows that students who were not practice inducedrnabortion were not significantly associated with contraception use.rnConclusion and Recommendation:-There is very high level of contraception use among sexuallyrnactive female undergraduate students who had unprotected sexual intercourse or a students who were notrnusing condom as a barrier method. This could be due to the fact that university students have relativelyrnbetter information and access to the service. Therefore, it is highly recommended that the Federal Ministryrnof Health make regular contraceptive methods accessible for students in higher institutions.