John Fitchett Marsh (24 October 1818 – 24 June 1880) was an English solicitor, official and antiquary.
On the death of his father, his guardian was his uncle John Fitchett, and Marsh later succeeded to his business as a solicitor.
[6][3][7] Marsh moved in 1873 to Hardwick House, Chepstow, Monmouthshire, and planned a history of the castles of the county.
[8] His large library, which included that of his uncle John Fitchett, was sold at Sotheby's in May 1882.
His Annals of Chepstow Castle were edited by Sir John Maclean, and printed at Exeter in 1883.