Background: Post abortion family planning is one of the recommended preventive services to reduce post abortion morbidity and mortality. The majority of abortions occur due to unintended pregnancies, which is a result of the non-use of family planning methods. However, post-abortion family planning utilization is still low in Ethiopia. Objective: To assess utilization of post abortion family planning and associated factors among women seeking abortion service at health facility of Zuway Dugda woreda, East Shewa Ethiopia, 2021. Method: Institutional based cross- sectional study was conducted among a total of 402 women who came to abortion service. Pre- tested interview structured questionnaire was used to collect the data .Systematic random sampling technique was used to select the study participants. Data entry and cleaning were done with Epii data then was exported to SPSS software for analysis. Binary and multiple logistic regressions were applied to see the association between post abortion family planning utilization with independent variables. Odds ratio and 95% Confidence Interval (CI) were used to measure the strength of associations. The results were considered statistically significant at p value P <0.05 for multiple regressions. RESULT: Overall post-abortion contraceptive utilization in this study was 70.1 %( CI: 65.4, 74.6). Single women (AOR, 4.0 95% CI (1.8-8)), above secondary educational level (AOR, 3.7; 95% CI (1.4, 9.7)), public health institutions ((AOR, 3.0 95% CI (1.5, 6.1)), having previous information about family planning(AOR 2.1 95% CI (1.2-3.9)), ever used contraceptives (AOR 5.4, 95% CI (2.9-9.9)), and received post abortion family planning counseling (AOR 5.7 95% CI (3.1-10.4)) were significantly associated with post abortion family planning utilization.  CONCLUSION AND RECOMMENDATION: Post abortion family planning utilization was high as compared to other studies. Marital status, educational level, owner of the facility, information access, ever used family planning and PAFP counseling was the significant factors to PAFP utilization. Greater emphasis should be given to providing post abortion contraceptive counseling to increase utilization of post abortion contraceptive use.  Keywords: post abortion, contraceptives utilization, women, Ethiopia