Background Risk factors and consequences associated with Clostridioides difficile infection (CDI) in children and adoles-cents with inflammatory bowel disease (IBD) are still uncertain.We conduct a systematic review and meta-analysis to assess risk factors and outcomes associated with CDI in children and adolescents with IBD.Methods PubMed,EMBASE and Cochrane Library databases were searched from inception to 24th February,2021.Studies investigating risk factors,bowel surgery rate in pediatric IBD patients with and without CDI were included.Random-effects model was used for calculating summary estimates.Newcastle-Ottawa scale (NOS) was used for quality assessment.Results Fourteen studies,comprising 17,114 patients,were included.There was a significant association between 5-ami-nosalicylic acid (5-ASA) use and CDI[odds ratio (OR) =1.95,95％ confidence interval (CI) 1.26-3.03],with minimal heterogeneity (I2 =0.00％).Increased risk of active disease (OR =4.66,95％ CI 2.16-10.07) were associated with CDI in those studies performed in high quality score (NOS ＞ 6) and significantly higher CDI rates in studies conducted outside USA(OR =2.94,95％ CI 1.57-5.58).The bowel surgery rate in IBD with CDI was 3.8-57.1％,compared to that in IBD without CDI (0-21.3％).All studies were of moderate to high quality.Conclusions 5-ASA use and active disease might be risk factors associated with CDI in children and adolescents with IBD.Bowel surgery rates associated with CDI in IBD patients varied greatly.Large-scale clinical studies on CDI in children and adolescents with IBD are still needed to verify risk factors and outcomes.