Patrick Duggan (10 November 1813 – 15 August 1896) was an Irish Roman Catholic clergyman who served as the Bishop of Clonfert from 1872 until his death.
He spent his early years on his mother's family farm at Carrownageehy, Milltown, County Galway.
In the 1872 Galway County by-election, Duggan organized support for Captain (later Lieutenant-Colonel) John Philip Nolan who was favourably disposed towards tenant rights.
Nolan was elected but lost his seat on the grounds of undue clerical influence, and Duggan was brought to trial with others before the Court of Common Pleas, but the case collapsed and he was acquitted.
Duggan declined due to illness, and suggested Thomas Croke, Archbishop of Cashel and Emly, in his place.