John Mowbray, 2nd Duke of Norfolk (1392 - 19 October 1432), was an English nobleman, who succeeded his father as Duke of Norfolk and became Earl Marshal of England. He sat in judgment on Richard, Earl of Cambridge. He married Lady Katherine Neville , daughter of the Earl of Westmorland; their only son would succeed Mowbray as Duke of Norfolk and Earl Marshal.

He went to France with Henry V and took part in the siege of Harfleur. He was too ill to fight at Agincourt.

He died in 1432 at Epworth, where his father had founded a monastery.