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Purpose: Neurodevelopmental disorders, such as autism spectrum disorder (ASD), have been increasingly associated with eosinophilic gastrointestinal disorders (EGID). However, the relationship between these diseases remains unclear. We performed a systematic review with meta‐analysis to address this issue. Methods: The search was performed according to the PRISMA guidelines using descriptors for ASD and EGIDs from the MEDLINE, Embase, PsycInfo, LILACS, and Web of Science databases. Observational studies with the prevalence of ASD in any EGID were included. The study protocol was registered on the PROSPERO platform under the number CRD42023455177. Results: The total dataset comprised 766,082 participants. The result of the single‐arm meta‐analysis showed an overall prevalence of ASD in the population with EGID of 21.59% (95% CI: 10.73–38.67). There was an association between EGID and ASD (OR: 3.44; 95% CI: 1.25–2.21), also significant when restricted only to EoE (OR: 3.70; 95% CI: 2.71–5.70). Discussion: Recent studies have implicated the influence of an inadequate epithelial barrier integrity in the pathogenesis of several diseases. The role of this mechanism can be extended to situations beyond allergic reactions, including other conditions with underlying immunological mechanisms. Several diseases are potentially related to the systemic effect of bacterial translocation in tissues with defective epithelial barriers. Conclusion: Our meta‐analysis provides evidence that supports the consideration of EGID in patients with ASD and ASD in patients with EGID. Despite its limitations, the results should also be validated by future studies, preferably using multicenter prospective designs in populations with low referral bias. [ABSTRACT FROM AUTHOR]