Planxty is an Irish folk music band formed in January 1972,:99–100 consisting initially of Christy Moore (vocals, acoustic guitar, bodhrán), Andy Irvine (vocals, mandolin, mandola, bouzouki, hurdy-gurdy, harmonica), Dónal Lunny (bouzouki, guitars, bodhrán, keyboards), and Liam O'Flynn (uilleann pipes, tin whistle). They quickly revolutionized and popularized Irish folk music, touring and recording to great acclaim.

Subsequently, Johnny Moynihan, Paul Brady, Matt Molloy (flute), Bill Whelan (keyboards), Nollaig Casey (fiddle) and, briefly, Noel Hill (concertina) and Tony Linnane (fiddle) were also temporary members.

Planxty broke up twice, first in December 1975:220 and again in April 1983.:306 The original quartet reunited in October 2003:316 and their final performance (to date) was on 31 January 2005.:324