The Rev. Prebendary James Dallaway FSA (20 February 1763 – 6 June 1834) was an English antiquary, topographer, and miscellaneous writer. He is known for his account of Constantinople and the Greek islands, published in 1797; and his county history of the western parts of Sussex, of which he published two volumes in 1815–19.
Dallaway was born at Bristol on 20 February 1763, the only son of James Dallaway (1730–87)), banker of Stroud, Gloucestershire, and his wife Martha (1739–83), younger daughter of Richard Hopton of Worcester. He was educated at Cirencester Grammar School, and then at Trinity College, Oxford, from where he graduated BA in 1782, and MA in 1784. He failed to obtain a fellowship there, supposedly because he had written some satirical verses on a senior and influential member of the college. Having been ordained deacon in 1785, he served as a curate at Rodmarton, Gloucestershire (serving under the Rev. Samuel Lysons, father of the antiquaries, Daniel and Samuel), and afterwards Rodborough in the same county. He lived at this time in a house called "The Fort" in Stroud.
He subsequently lived at Gloucester, and from about 1785 to 1794 was employed as the editor of Ralph Bigland's county history, Historical, Monumental, and Genealogical Collections relative to the County of Gloucester, which had been left unpublished at Bigland's death. He saw two volumes into print, but the arrangement ended when he quarrelled acrimoniously with Bigland's son, Richard. He was elected a fellow of the Society of Antiquaries of London in 1789; and in 1793 he published Inquiries into the Origin and Progress of the Science of Heraldry in England, with Explanatory Observations on Armorial Ensigns. He returned to Oxford, where he studied medicine at the Radcliffe Infirmary, graduating MB in December 1793.