Background: Since 1966, Family Guidance Association of Ethiopia (FGAE) started modern family planning in Ethiopia; even though the contraceptive prevalence rate/CPR/remain 28.6%. Ethiopia is the 2nd most populous country in Africa with it fast population growth rate. Every year 1million unwanted pregnancy, 3400 abortion, 130,000 infant deaths and more than 6800 women die during child birth. So, long term family planning is vital approach to halt problems arising from fast population growth and complication related with pregnancy. Therefore, this study aimed to assess the determinants of long acting reversible contraceptive utilization among child bearing age women in Dendi district. Methods: Institution based cross sectional study was conducted among child bearing age women cameto family planning unit of Dendi district health centers, western Ethiopia from May to June 2013. A total of 317 women were nominated using systematic sampling technique after selecting two health centers found in the district using simple random sampling. Result and conclusion: Total of 301 Women in child bearing age (WCA) were participated in this study and 236(78.4%) were married, 164(54.5%) were25-34 age group with a mean age of 29.3 and SD of 7. The long acting reversible contraceptives (LARCs) prevalence rate among Women in child bearing age was 17.6%. Educational status (AOR=2.82 95%CI=(1.01, 4.39), spousal discussion (AOR=3.34, 95%CI=(1.01, 7.78), spousal approval (AOR=1.99, 95%CI=(1.11, 5.08) and family size (AOR=5.9 95%CI=(3.44, 13.43) found to have significant association with long acting reversible contraceptive methods use. Conclusion and recommendation: Current LARCs prevalence among child bearing age women was 17.6%. Spousal discussion, partner approval, number of children and the educational status of the women found to be significant factors with LARCs. West Shewa health office should increase competence of service provider and create awareness on the availability of the service, as well there should be male participatory awareness creation programs regarding LARCs.