Larry Kirwan (born 1948 in Wexford) is an expatriate Irish writer and musician, most noted as the lead singer for the rock band, Black 47, and conceiver/co-writer of Paradise Square, the Broadway Musical for which he received a Tony Award nomination.

Prior to Black 47, Kirwan and fellow Wexfordian Pierce Turner were the house band in Malachy McCourt's Bells of Hell in Greenwich Village. Their music was a blend of folk, trad, progressive rock, Celtic rock and punk. Turner & Kirwan of Wexford was one of the few groups banned from CBGB’s. In the words of Hilly Kristal they were "too demonic". They then led the new wave band Major Thinkers for some years. Their song Avenue B (is the place to be) became a radio hit whereupon they were signed to Epic-Portrait Records. They recorded an album: Terrible Beauty, that was never released and after a performance in Irving Plaza on St. Patrick's Day 1985 they disbanded.

Kirwan then devoted himself to playwriting and the theatre. However, he continued to play improvisational music behind the poet, Copernicus, and in June 1989, the Copernicus band toured West Germany, Czechoslovakia, Poland, Lithuania, and the USSR. He also formed Chill Faction with Thomas Hamlin, Major Thinkers drummer, and members of the Copernicus band, Fred Parcells, David Conrad, and Mike Fazio, all of whom would go on to play and record with Black 47.

Kirwan has written 20 plays and musicals, most of which have been performed in the United States and Europe. The plays often deal with Irish and New York history and politics. The most often produced is Liverpool Fantasy (If The Beatles hadn’t made it). Five of the plays: Liverpool Fantasy, Days of Rage, Mister Parnell, Blood and Night in the Garden are published in the book, Mad Angels.

Kirwan collaborated on a musical: Transport, with Australian author Thomas Keneally that was produced at The Irish Repertory Theater in NYC in 2014. On April 3, 2022 his Broadway debut Paradise Square opened at the Ethel Barrymore Theatre after successful runs at Berkeley Repertory Theatre in 2019 and at The Nederlander Theatre in Chicago 2021.

Kirwan formed Black 47 with Chris Byrne in late 1989 after a jam in Paddy Reilly's Pub in Manhattan. The band has released 16 CDs including Fire of Freedom (1993) containing the hit Funky Ceili; Iraq (2008) and Bankers and Gangsters (2010). Black 47 performed approximately 2500 shows before disbanding Nov. 14th, 2014 after their final gig at BB Kings in Manhattan.

Since April 2005, he has hosted Celtic Crush, a radio show on Sirius Satellite Radio that features artists from the 8 Celtic nations who play a wide variety of genres. He also writes a weekly column for the Irish Echo. He has published several books, including a novel version of Liverpool Fantasy and Rockin' The Bronx, the latter of which was published in February 2010. His latest novel, Rockaway Blue, was published in 2021 by Three Hills/Cornell University Press.

In 2013, he co-produced a various artists compilation for Valley Entertainment titled Larry Kirwan's Celtic Invasion.

He is an occasional footballer, and generally as a striker with his left foot.