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Crohn’s disease (CD) is a chronic transmural inflammation of intestinal segments caused by dysregulated interaction between microbiome and gut immune system. Here, we profile, via multiple single-cell technologies, T cells purified from the intestinal epithelium and lamina propria (LP) from terminal ileum resections of adult severe CD cases. We find that intraepithelial lymphocytes (IEL) contain several unique T cell subsets, including NKp30⁺γδT cells expressing RORγt and producing IL-26 upon NKp30 engagement. Further analyses comparing tissues from non-inflamed and inflamed regions of patients with CD versus healthy controls show increased activated T_H17 but decreased CD8⁺T, γδT, T_FH and Treg cells in inflamed tissues. Similar analyses of LP find increased CD8⁺, as well as reduced CD4⁺T cells with an elevated T_H17 over Treg/T_FH ratio. Our analyses of CD tissues thus suggest a potential link …