Sir John de Mowbray, 2nd Duke of Norfolk, 9th Baron Segrave, 8th Baron Mowbray KG, Earl Marshal (1392 – 19 October 1432) was an English nobleman.
He was the younger son of Thomas de Mowbray, 1st Duke of Norfolk, and succeeded his elder brother Thomas as 5th Earl of Norfolk and 3rd Earl of Nottingham in 1405. He was appointed Earl Marshal of England in 1412 and in 1415 sat in judgment on Richard of Conisburgh, 3rd Earl of Cambridge. In 1425 he was restored to his father's confiscated Dukedom of Norfolk.
He married Lady Katherine Neville, daughter of Ralph Neville, 1st Earl of Westmorland, and had only one son, John, later 3rd Duke of Norfolk.
He went to France with King Henry V and took part in the siege of Harfleur. He was too ill to fight at Agincourt.
He died in 1432 at Epworth, Lincolnshire, where his father had founded a monastery.
| Political offices | ||
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| Preceded by The Earl of Westmorland |
Earl Marshal 1412–1432 |
Succeeded by The Duke of Norfolk |
| Peerage of England | ||
| Vacant
Forfeit 1399
Title last held by
Thomas de Mowbray |
Duke of Norfolk 1st creation 1425–1432 |
Succeeded by John de Mowbray |
| Preceded by Thomas de Mowbray |
Earl of Norfolk 3rd creation 1405–1432 |
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| Earl of Nottingham 2nd creation 1405–1432 |
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| Baron Mowbray 1405–1432 |
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| Baron Segrave 1405–1432 |
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