The small collection of ancient Near Eastern seals in the school museum at Charterhouse was called to our attention by the kindness of Mr. Ian Blake. It was assembled in the nineteenth century through two gifts, that of D. G. Prinsep in 1876 (eight cylinders) and that of Leonard Marshall in 1896 (sixteen cylinders and five Sassanian stamp seals). No information has survived about the exact source of these seals, though, as will be seen, they might well all come from sites in southern Iraq. We are most grateful to the Governors and Headmaster of Charterhouse for allowing these seals to be taken to Oxford for study and photography. The School authorities also subsidized the cost of photography, which was done by Mr. R. L. Wilkins of the Institute of Archaeology in Oxford. In the following concise catalogue Professor O. R. Gurney is responsible for the seal inscriptions (save for a single Sassanian one kindly read by Dr. A. D. H. Bivar), and Dr. P. R. S. Moorey for the classification, description and discussion of the designs. We gratefully acknowledge advice on various points from Mr. Briggs Buchanan and Professor W. Lambert, who bear no responsibility for any persisting errors. For the abbreviations used in the catalogue see pp. 80–1. Measurements given are in millimetres (height × width); figures such as 1–1956–2 are the Charterhouse registry numbers.