John Courtenay (1520/1521 – 1560) of Tremere (now Tremore) in the parish of Lanivet in Cornwall, was a Member of Parliament.
He was the third child from Richard Courtenay's second marriage to Jane Boscawen.
In the autumn of 1553, Courtenay used his family's connection with the Lostwithiel constituency to have himself elected the town's junior Member in Mary's first Parliament.
He died on 1 March 1560, being buried at Lanivet, where a monument was erected to his memory.
He left life interest in the Tremere property to his widow, Elizabeth Trengrove, who later married Thomas Arundell.