Background. Inappropriate complementary feeding practices are amongst the key causes of child undernutrition. It rises the risk of undernutrition, illness, and mortality among children. Objectives. This study was aimed to determine the pooled prevalence of MMF practice and associated factors among children aged 6 to 23 months in Ethiopia. Methods. The search was conducted by using the following electronic databases; PubMed/MEDLINE, HINARI, EMBASE, Google Scholar, Web of Science, Scopus, African journals, and Google for grey literature. The publication bias was determined by using a funnel plot and Egger’s test. The heterogeneity between the studies was checked by using I2 statistic. The subgroup analysis was done by sample size, region, and year of publication. Result. A total of 20 studies with 12 656 study participants were included in the present systematic review and meta-analysis. The pooled prevalence of MMF practice among children aged 6 to 23 months in Ethiopia was estimated to be 63.80% (95%CI: 56.59, 71.01). PNC visit (AOR = 1.90, 95%CI [1.31, 2.49]), wealth index (AOR = 2.11, 95%CI [1.42, 2.81]) and age of child (AOR = 5.75, 95%CI [4.25, 7.26]) were factors significantly associated with MMF among children aged 6 to 23 months. Conclusion. The findings showed that the pooled prevalence of MMF among children aged 6 to 23 months in Ethiopia was relatively low. PNC visit, wealth index and age of child were factors significantly associated with MMF among children aged 6 to 23 months. Therefore, community-based health education concerning the recommended MMF among children aged 6 to 23 months is required to take place.