Introduction: women in developing countries over their reproductive life span conceive andrnnourish with their own bodies six to eight children. Because of the high energy and nutrientrndemands of pregnancy and lactation, women spend a large proportion of their reproductive yearsrnunder possible nutritional stress. Short interpregnancy intervals or early pregnancies resultingrnmaternal depletion of energy and protein& micronutrients leads to a reduction in maternalrnnutritional status at conception and altered pregnancy outcomes. Extending birth spacing and givingrnwomen longer non-pregnant, non-lactating intervals provides them the time they need to replenishrntheir energy and micronutrient stores.rnObjective: To Assess the Effect of Modern Family Planning Method(MFP) utilization onrnnutritional status of women in the reproductive age group (15-49 years) in Tena District, Arsi ZonernOromiya Region, Ethiopia.rnMethod: A community based quantitative comparative cross- sectional study complemented byrnqualitative method was conducted in 2013. The study was conducted at Tena Woreda, Arsi ZonernOromiya region. Three kebeles were selected randomly and prior to the study FP users at least forrnone year and non-users before the actual data collection were identified. A systematic randomrnsampling procedure was employed to select the study subjects. Data were entered and analyzedrnusing Epi info version 3.5.1 and SPSS version 17 software .Logistic regression was done to assessrnthe association of independent variables on dependent variable. To see the effect of ever MFPMrnutilization on the nutritional status, it was run using three multi-variate models.rnResult: The prevalence of low weight (p