Banjo enclosures are an important archaeological site type within British Iron Age studies, particularly for southern England. Significant numbers of these sites have been discovered through aerial survey but only a comparatively small number have been explored through additional survey and excavation. Chronologically these sites wholly exist within the Middle and Late Iron Age periods, c. 400 bc to ad 43. As yet there has been no standard interpretive framework for these sites and our understanding and discussion has often been based on the theoretical model most popular at the time of investigation. A key aim of his paper is to question this piecemeal approach and incorporate more recent interpretations from a much-expanded dataset. Since the 1990s large-scale landscape surveys have increased considerably the numbers of sites identified and subsequently the regions in which they are located. Tying this in with recent excavations, we have begun to redefine our understanding of banjo enclosures as more complex in their site development and function, while also providing a simplified framework which accounts for the diversity of forms, locations, and relative associations. Ultimately these enclosures are more complex than previously realised, potentially serving a multiplicity of functions with different phases of use throughout a period of significant change at the end of prehistory.