John Joseph Kennedy (15 July 1968 - ) is an Irish Catholic Archbishop and secretary for Discipline at the Dicastery for the Doctrine of the Faith (DDF) since his appointment in 2022.

Among the positions held in Ireland he was Vice-Parish Priest of St. Agnes Church, then of St. Nicholas of Myra in Dublin.

In an interview with Zenit, he described his reaction to hearing of the resignation of Benedict: “You sometimes meet people who ask you: ‘Do you remember where you were on the day when JFK was shot, or the Twin Towers came down, or when World War II ended?’ I can think very clearly of exactly where I was.” He was "in the north of Italy, and I was just ready to leave the hotel after a two-day ski trip, and my brother phoned and said: 'What's going on in Rome?'

[1] On his appointed as prefect, Cardinal Fernández was instructed by Pope Francis to focus on the Dicastery's doctrinal work and leave the disciplinary section alone.

[7] In Sept 2024, Archbishop Kennedy upheld the laicisation of Ariel Alberto Principi, a former diocesan priest convicted of child sexual abuse, disagreeing with an order from Secretariat of State.