The first Mulligan's was established in Thomas Street, Dublin in 1782. The Mulligan family moved their business to several different premises until finally leasing the present building in Poolbeg Street in 1854. Mick Smyth bought the pub from John Mulligan in 1932. Ownership later passed to Smyth's nephews, Con and Tommy Cusack, before passing to Tommy Cusack's sons.
The former Theatre Royal in Hawkins Street was near Mulligan's and the pub walls are decorated with associated posters, photographs, and showbills dating back to the early nineteenth century, as well as an autographed photograph of Judy Garland, who performed in the theatre and drank at the pub.
The pub is mentioned briefly in James Joyce's short story, Counterparts, and was used as a filming location on a number of occasions. Journalists and writers drank at Mulligans during the twentieth century, including staff from the Irish Times and from the former Irish Press newspaper - which operated next door until the collapse of the paper in 1995. A number of Dublin musicians also drank there, as several music industry management offices were in the nearby Corn Exchange Building.
- The History of Mulligan's Mulligan's, 1994.
- "Mulligans, The grand old pub of Poolbeg Street : Timeline". Retrieved 18 August 2016.
- "Barfly: Mulligan's of Poolbeg Street, Dublin 2". Life and Style. Irish Times. 24 December 2015. Retrieved 18 August 2016.
- "Crowds at the bar as Mulligan's celebrates book launch". Irish Times. 2 June 2015. Retrieved 18 August 2016.
- "Legendary pub Mulligans is brought to book". Irish Independent. 2 June 2015. Retrieved 18 August 2016.
- "Phantom footsteps and flying bottles: Ghost stories from Dublin's John Mulligan's pub". The Journal. 24 May 2015. Retrieved 18 August 2016.
- Text of Joyce's story, Counterparts. "When the Scotch House closed they went round to Mulligan's." Project Gutenberg. Retrieved: 2010-01-07.
- Jez Conolly, Caroline Whelan (2011). World Film Locations: Dublin. Intellect Books. p. 30. ISBN 9781841505503.
- "Category: Screen (Film and television productions that use or have used Mulligans as a location)". Mulligansbook.com. Retrieved 18 August 2016.
- Colm Quilligan (2008). Dublin literary pub crawl: a guide to the literary pubs of Dublin and the writers they served. Writers' Island. pp. 94–96. ISBN 9780955932700.