Cotton Cleopatra A.iii is an Anglo-Saxon manuscript once held in the Cotton library, now held in the British Library, and contains three glossaries, providing important evidence for Old English vocabulary, as well as for learning and scholarship in Anglo-Saxon England generally. The manuscript was probably written at St Augustine's, Canterbury, and has generally been dated to the mid-tenth century, though recent work suggests the 930s specifically. The manuscript contains three Latin-Old English glossaries.