The study examined factors influencing the deposit mobilization effects of interest free bankingrnservice in selected private commercial banks. The study was conducted based on data collectedrnfrom customers of the three banks through questionnaires and interview from experts of interestrnfree banking services. To achieve the objectives of the study respondents were drawn from thernselected three private banks of Oromia international bank s.c, Awash Bank s.c and United bankrns.c using convince sampling. Data was collected through questionnaire by using clusterrnsampling from a sample of 382 and 359 were properly filled and returned. Besides, Semistructuredrninterviews were used to guide for the qualitative data collection tools.rnThe reliability of the data instrument were tested based on Cronbach Alpha r= 0.875 which isrnGood and Questionnaire validity were confirmed by the advisor, technical experts of IFB andrnusing factor analysis (KMO) and Bartlettâ€™s Test 0.656 which is close to 0.7 to ensure thernquestionnaires were consistent, clear and explains the variable under the study. The datarncollected from the questionnaire were analyzed using descriptive statistics, correlation andrnregression analysis with SPSS version 20 statistical tools.rnThe hypotheses result of the study showed that the independent variable of Diversity of IFBrnservice, Customer awareness and skilled manpower have a positive relationship and significancernon deposit mobilization(dependent variables) of interest free banking service