Baron Mowbray is a title in the Peerage of England. It was created by writ for Roger de Mowbray in 1283. The title was united with the Barony of Segrave in 1368, when John Mowbray, 1st Earl of Nottingham and 5th Baron Mowbray succeeded to that title, and in the next generation, the Baron Mowbray was named Duke of Norfolk. With the childless death of Anne Mowbray, 8th Countess of Norfolk in c.1481, the Barony went into abeyance between the Howard and Berkeley families, and both styled themselves Baron Mowbray and Seagrave.