gammadelta T-cells are a numerically small subset of T-cells with distinct features. They recognise antigens that are not seen by other immune cells. At the functional level, gammadelta T-cells share some features with alphabeta T-cells but also exert functions that are otherwise performed by specialised subsets of alphabeta T-cells (e.g. IL-17 production, regulatory activity). We discuss the potential role of gammadelta T-cells in various clinical forms of vasculitis.