William Conyngham Plunket, 4th Baron Plunket was Dean of Christ Church Cathedral and Archbishop of Dublin in the Church of Ireland.

The Dean of Christ Church Cathedral, Dublin is dean and head of the chapter of the Cathedral of the Holy Trinity, commonly called Christ Church Cathedral, which is the cathedral church of the United Diocese of Dublin and Glendalough in the Church of Ireland. The dean is appointed by the Church of Ireland Archbishop of Dublin. Aspects of the cathedral administration are overseen by the Cathedral Board, which the Dean chairs with both a regular and a casting vote.