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Celiac Disease (CD) is an autoimmune disorder triggered by gluten ingestion that can develop in genetically predisposed individuals. Alterations in the gut microbiota have been suggested to contribute to development of autoimmune conditions including CD. Recent work suggests the existence of a blood microbiota. Evidence that alterations in the blood microbiota potentially influence the development of chronic immune based diseases is increasing. However, there is no published literature regarding the blood microbiota in children, including those with CD. This study aimed to characterize the diversity and taxonomic composition of the blood microbiota of children with CD compared to controls. Whole blood samples were collected from children with active CD, CD in remission, and control subjects and 16S rRNA sequencing was utilized to analyze the blood microbiota. We found 16s rRNA present throughout all pediatric blood samples, providing evidence for the presence of a pediatric blood microbiota. We found significant differences in beta diversity and in abundance of certain taxa (Campylobacterales order, Odoribacteraceae and Helicobacteraceae families, Odoribacter genus and species, and Bacteroides acidifaciens species) between subjects with active CD and controls. These taxa have been previously reported to be associated with immune response and gut-inflammatory diseases. We did not find significant differences between subjects with active and remission CD or between remission CD and controls. Conclusions: We provide evidence for a pediatric blood microbiota and identified higher beta diversity and alterations in the composition of blood microbiota in subjects with active CD compared to controls., Competing Interests: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Alessio Fasano reports a relationship with Alba Therapeutics that includes: equity or stocks. Alessio Fasano reports a relationship with Innovate Biopharmaceuticals that includes: consulting or advisory. Alessio Fasano reports a relationship with Axial Biotherapeutics that includes: board membership. Alessio Fasano reports a relationship with Viome that includes: board membership. Alessio Fasano reports a relationship with Mead Johnson Nutrition that includes: speaking and lecture fees. Maureen M Leonard reports a relationship with Anokion that includes: consulting or advisory. Maureen M Leonard reports a relationship with 9meters biopharma that includes: board membership. Victoria M Martin reports a relationship with Milk Care Co that includes: board membership., (© 2021 The Authors. Published by Elsevier B.V.)