Patrick Mulligan (born 9 June 1912 – 21 January 1990) was the Roman Catholic Bishop of Clogher in Ireland from 18 January 1970 until 7 July 1979, when he was succeeded by Joseph Duffy.

He was born at Lisbellaw, County Fermanagh^[1] and educated at St Macartan's College, Monaghan and St Patrick's College, Maynooth.^[2]

He studied for the priesthood at St Patrick's College, Maynooth, and was ordained a priest of the Diocese of Clogher in 1937, a classmate of Cardinal William Conway. Later, Mulligan served as Diocesan Secretary for a period and also a teacher in St Macartan's College, Monaghan, and St Tiarnach's School, Clones, County Monaghan. He became the first President of St Michael's College, Enniskillen in 1957, retiring from that position in the summer of 1966.

In that year, he was appointed Archdeacon of Clogher and Parish Priest of Carrickmacross.^[3]

Mulligan's appointment as Bishop of Clogher was made on 28 November 1969 and he received episcopal ordination two months later on 18 January 1970. The Archbishop of Dublin John Charles McQuaid was invited to concelebrate the ordination Mass but refused to participate in this then novel way.^[4]

As bishop he oversaw the implementation within the diocese of many of the changes brought about by the Second Vatican Council and during his term three new churches and several schools were built in the diocese. He was a knowledgeable and published author of local history and Irish language expert.^[5][4]

He was succeeded by Joseph Duffy and while in retirement wrote a short History of the Diocese of Clogher as well as several articles for local historical journals, serving several terms as President of the Clogher Historical Society.^{[citation needed]}

Mulligan died on 21 January 1990, aged 77 years and is buried in the grounds of his Cathedral, alongside his predecessor.^[6]

• Diocese of Clogher
• St. Michael's College (Enniskillen)