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John (I) de Mowbray, 2nd Baron Mowbray (4 September 1286 – 23 March 1322) was the son of Roger de Mowbray, 1st Baron Mowbray. Lord of the manors of Tanfield and Well, Yorkshire.
De Mowbray served in the Scottish wars of Edward I. The baron held such offices as sheriff of Yorkshire, governor of the city of York, a warden of the Scottish marches, governor of Malton and Scarborough Castles.
- John, (b. 29 November 1310, Yorkshire, England d.1361 who succeeded his father to the barony.
- Alexander, (c. 1314 – c. 1391.)
John de Mowbray was buried at Fountains Abbey.
- Burke, Sir Bernard. "Mowbray-Earls of Nottingham, Dukes of Norfolk, Earls-Marshal, Earls of Warren and Surrey." A Genealogical History of the Dormant, Abeyant, Forfeited, and Extinct Peerages, of the British Empire. London: Wm Clowes and Sons, Ltd, 1962. p. 387.
- Cokayne, G.E., ed. (1936). The Complete Peerage. Vol. 9. Revised and enlarged by H.A. Doubleday and Lord Howard de Walden (2nd ed.). London: St. Catherine Press.