John de Grey, 1st Baron Grey de Rotherfield

John de Grey, first Baron Grey of Rotherfield (1300–1359), was an English soldier and courtier, the son of Sir John de Grey. He began soldiering in 1321, serving in Scotland and Gascony.

He wanted to marry Eleanor de Clare, widow of Hugh le Despenser the Younger, but lost her to William la Zouche after a quarrel that briefly put both men in prison. Summoned to parliament from 1338, he was one of the founding Knights of the Garter in 1348 and from 1349 served as Lord Steward of Edward III's household almost until his death.

He married first Katherine FitzAlan of Bedale and then Avice Marmion, and died in September 1359; his son John by Katherine succeeded as second baron.