Liam Óg O'Flynn (Irish: Liam Ó Floinn, 15 April 1945 – 14 March 2018) was an Irish uilleann piper and Irish traditional musician. In addition to a solo career and as a member of Planxty, O'Flynn recorded with: Christy Moore, Dónal Lunny, Andy Irvine, Kate Bush, Mark Knopfler, the Everly Brothers, Emmylou Harris, Mike Oldfield, Mary Black, Enya and Sinéad O'Connor.
O'Flynn was acknowledged as Ireland's foremost exponent of the uilleann pipes and brought the music of the instrument to a worldwide audience. In 2007, O'Flynn was named Musician of the Year at the TG4 Gradam Ceoil Awards, considered to be the foremost recognition given to traditional Irish musicians.