Duggleby Howe (also known as Howe Hill, Duggleby) is one of the largest round barrows in Britain, located on the southern side of the Great Wold Valley in the district of Ryedale, and is one of four such monuments in this area, known collectively as the Great barrows of East Yorkshire. Duggleby Howe is believed on the basis of artefacts recovered to be of Late Neolithic date, but no radiocarbon dates are available.