For a T-cell subset to be classified as immunoregulatory, it might reasonably be predicted that in its absence, animals would experience pathological immune dysregulation. Moreover, reconstitution of the subset should restore normal immune regulation. So far, these criteria have been satisfied by only a few of the candidate regulatory T-cell subsets, but among them is the intraepithelial γδ T-cell receptor (TCR)⁺ subset of mouse skin. In this article, we look at immunoregulatory γδ T cells, and the growing evidence for tissue-associated immunoregulation mediated by both γδ T cells and αβ T cells.