Denis Nulty KC*HS (born 7 June 1963) is an Irish Roman Catholic prelate who has served as Bishop of Kildare and Leighlin since 2013.

[2] Following his ordination, Nulty served for ten years as a curate in the cathedral parish of Mullingar, as well as chaplain to the local Accord centre and spiritual director at St Finian's College.

[5] Nulty was appointed Bishop-elect of Kildare and Leighlin by Pope Francis on 7 May 2013, becoming the youngest bishop in Ireland by succeeding the Archbishop of Armagh, Eamon Martin, by two years.

[11] Ahead of a referendum on easing divorce restrictions in May 2019, he issued a statement suggesting that "the objective of the proposed referendum is not to support marriage, rather to liberalise divorce", and that "it is imperative that we continue to work together to promote marriage and family.”[12] Following the installation of Dermot Farrell as Archbishop of Dublin on 2 February 2021, Nulty was announced as Apostolic Administrator of Ossory.

[15][16][17][18] Following the easing of restrictions brought about by the COVID-19 pandemic, Nulty announced on 4 July that for the first time in living memory, a confirmation ceremony would take place in the open-air surroundings of a GAA stadium, with 392 primary school children from four parishes in Kilkenny city receiving the sacrament on 9 September in Nowlan Park, Kilkenny.