摘要:Abstract Background Despite Ethiopia’s efforts to avail postpartum family planning (PPFP) services, the unmet need for family planning among postpartum women remains high. Therefore, this study is aimed to assess barriers and determinants of postpartum family-planning uptake among women visiting Maternal, Neonatal, and Child Health (MNCH) services in public health facilities of western Ethiopia. Methods A facility-based cross-sectional study design with a quantitative method was conducted on 989 postpartum women in Western Ethiopia from September 1 to October 30, 2020. Data were collected through face-to-face interviews using pretested structured questionnaires, entered using EPI-INFO version 7.0, and analyzed by SPSS version 25. Descriptive analysis and logistic regressions were performed. The adjusted odds ratio with a 95% confidence interval was used and statistical significance was declared at P-value < 0.05. Result In this study, 56.1% of participants had used PPFP in the last year. The most commonly used method was injectable (51.7%). Family planning use before the index pregnancy (AOR = 2.09;95%CI:1.29,3,41),counselling on PPFP during antenatal care and delivery (AOR = 4.89;95%CI:2.31,10.37),health facility delivery (AOR = 7.61;95%CI:4.36,13.28), skilled birth attendance (AOR = 4.99;95%CI:2.88,8.64),COVID-19 restrictions (AOR = 0.59;95%CI:0.39,0.90) were factors associated with PPFP utilization. Being breastfeeding and amenorrhea were major reasons for not using postpartum family planning. Conclusion Post-partum family planning utilization among study participants was low. Given the associated factors, it is recommended that health facilities should make postpartum family planning one of their top priorities and focus on these factors to improve its utilization.