| O generale | Voce Ventu & Jean‐Louis Aubert | | | 4:01 | instrument |
| O Jesulein süß | The Choir of Christ Church Cathedral, Dublin | | | 4:06 | instrument |
| O Jesus Mine | Vineyard UK | | | 3:59 | instrument (as “ullian pipes”) |
| O Virgin Church (O virgo Ecclesia) | Richard Souther | | | 5:12 | instrument arranger, recording, instrument |
| O'Carolan's Concerto | Jerry O’Sullivan, Paul Cienniwa & Audrey Sabattier-Cienniwa | | | 3:19 | instrument |
| O'Carolan's Cup and the Blush of Aurora | Jerry O’Sullivan, Paul Cienniwa & Audrey Sabattier-Cienniwa | | | 4:27 | instrument |
| O’Carolan’s Welcome / Rolling in the Barrel | Lúnasa | | | 3:49 | instrument (as “pipes”) |
| O'Farrell's Welcome to Limerick | Erich Kunzel and the Cincinnati Pops Orchestra | | | 3:03 | instrument |
| O’Neill’s Statement | Davy Spillane | | 3 | 5:52 | instrument |
| O’Sullivan’s March | The Chieftains | | | 4:00 | instrument |
| O'Sullivan's March From Rob Roy | Boston Pops Orchestra; Jerry O'Sullivan | | | 3:04 | instrument |
| Ocean’s Call | Matt Steady | | | 18:35 | instrument |
| Of Fire, Wind & Wisdom | Eluveitie | | | 3:28 | instrument |
| Of Fire, Wind & Wisdom | Eluveitie | | 3.65 | 3:06 | instrument |
| Of Fire, Wind and Wisdom | Eluveitie | | | 3:33 | instrument |
| Of This Land | Clannad | | | 4:44 | instrument |
| Ogmios | Eluveitie | | | 0:29 | instrument |
| Ogmios | Eluveitie | | | 3:13 | instrument |
| Ogmios (instrumental) | Eluveitie | | | 3:19 | instrument |
| Oh Onochie O | Bonnie Rideout | | | 5:09 | instrument |
| Oh to Kiss Katie | Kíla | | | 4:13 | instrument (as “píobaí uilleann”) |
| Ojitos negros | The Chieftains with Los Cenzontles | | | 2:26 | instrument (as “pipe drones”) |
| Old Bush / The Virginia Reel | Kane O’Rourke | | | 3:25 | instrument |
| Old Molly Hare | Wizz Jones | | | 1:17 | instrument |
| Old Tipperary | Niall and Cillian Vallely | | | 3:42 | instrument |
| Old Tipperary - Jig | Séamus Connolly, Padraic Mac Mathuna | | | ?:?? | instrument |
| Omnos | Eluveitie | | 4.5 | 3:48 | instrument |
| Omnos (early metal version) | Eluveitie | | | 3:49 | instrument |
| Once in a Blue Moose | Niall and Cillian Vallely | | | 4:05 | instrument |
| Once in Royal David's City | Celtic Aire | | | ?:?? | instrument |
| Once in Royal David’s City | The Choir of Christ Church Cathedral, Dublin | | | 4:40 | instrument |
| One Day We'll See Them | Alex Campbell | | | 3:37 | instrument |
| One Last Soul | Black Country Communion | | 5 | 3:52 | instrument |
| One Who Bares Fangs at God | Josh Barron | | | 4:22 | instrument |
| Only the Brave | Mostly Autumn | | | 5:36 | instrument |
| open your heart | 梶浦由記 | | 5 | 4:40 | instrument |
| Opening Medley: a) Dóchas / b) King of Laois / c) Paddy’s Jig / d) O’Keefe’s / Chattering Magpie—Reels | The Chieftains | | | 9:19 | instrument |
| Orfeo | Anna & Elizabeth | | | 6:17 | instrument, recording |
| Origins | Eluveitie | | | 2:13 | instrument |
| Orinoco Flow | Celtic Woman | | 4.25 | 3:32 | instrument |
| Orinoco Flow | The Spirit of Eden | | | 5:03 | instrument |
| Os amores libres | Carlos Núñez | | | 2:15 | instrument |
| Otherworld | Eluveitie | | 3.25 | 1:57 | instrument |
| Otherworld Set | Eluveitie | | 3.5 | 2:34 | instrument |
| Ould Hag You’ve Killed Me / An Coileach ag Fogairt an Lae | Martin Denning, Noreen Leech, Mick McNamara, Ciaran O’Driscoll, Paul Skehill | | | 3:02 | instrument |
| Our Decades in the Sun | Nightwish | | 3 | 6:39 | instrument |
| Our Decades in the Sun | Nightwish | | | 6:40 | instrument |
| Outro: Imaginaerum | Nightwish | | | 3:46 | instrument |
| Outro: Imaginaerum | Nightwish | | 2.5 | 6:16 | instrument |
| Over the Sea to Skye | Celtic Aire | | | ?:?? | instrument |
| Paddy Fahy’s / The Maspeth Reel / Mighty Keith O’Neill | Comas | | | 5:29 | instrument |
| Paddy Taylor's / Hold the Reins / Famous Ballymote | Caroline Keane & Tom Delany | | | 2:48 | instrument |
| Paddy’s Green Shamrock Shore | Paul Leech, Paul McNevin, Daragh O’Reilly | | | 3:43 | instrument |
| Paddy’s Rambles Through The Park (slow air) / Taibhse Chonaill (single jig) | Tiarnán Ó Duinnchinn & Ryan Molloy | | | 5:38 | instrument |
| Pan | Nightwish | | 3.35 | 5:18 | instrument |
| Pan (instrumental) | Nightwish | | | 5:18 | instrument |
| Parade De La Bastille (Instrumental Version) | A. R. Rahman | | | 3:41 | instrument |
| part a: Eistigh Liomsa Sealad/Listen to Me part b: Saor Reprise | Afro Celt Sound System | | | 10:54 | instrument |
| part a: Saor/Free part b: News From Nowhere | Afro Celt Sound System | | | 8:21 | instrument |
| part a: Sure-as-Not part b: Sure-as-Knot (Jungle Segue) | Afro Celt Sound System | | | 9:58 | instrument |
| Passion Moment | 崎元仁 | | | 4:13 | instrument |
| Past Time With Good Company | Blackmore’s Night | | | 9:06 | instrument |
| Past Time With Good Company | Blackmore’s Night | | | 8:17 | instrument (as “pipes”) |
| Peggy and the Soldier | Connie Dover | | | 4:32 | instrument |
| Peggy Gordon | The Chieftains w/ The Secret Sisters | | | 4:11 | instrument |
| Persecución de Villa | The Chieftains with Mariachi Santa Fe de Jesus (Chuy) Guzman | | | 2:57 | instrument |
| Phaedra's Meadow | Blue Rodeo | | 2 | 5:26 | instrument |
| Phase I: Singularity | Ayreon | | | 23:29 | instrument |
| Phase III: Entanglement | Ayreon | | | 22:35 | instrument |
| Phil Ochs Speaks | Eric Andersen | | | 0:47 | instrument |
| Piece: The Humours of Glynn | Brian McNamara | | | 3:14 | instrument |
| Pipe Gavot and Union Pipe Gavot | Jerry O’Sullivan, Paul Cienniwa & Audrey Sabattier-Cienniwa | | | 4:13 | instrument |
| Piper at the Gates of Dawn | Van Morrison | | 1 | 3:53 | instrument |
| Piper's Dream | Rafael Pacha | | | 4:54 | instrument |
| Pipes of… | Shannon | | | 5:24 | instrument |
| Planxty Irwin | Guy Carawan | | | 2:15 | instrument |
| Planxty Miss Maxwell | The Green Fields of America | | | 2:24 | instrument |
| Planxty Noel Hill | The Pogues | | | 3:09 | instrument |
| Play Minstrel Play | Blackmore’s Night | | | 6:02 | instrument |
| Play Minstrel Play | Blackmore’s Night | | | 5:14 | instrument (as “pipes”) |
| Port na bPucaí (air) | Davy Spillane & Kevin Glackin | | | 3:42 | instrument |
| Possum Goes to Prague | Blackmore’s Night | | | 2:04 | instrument |
| Potato Picking | Mark Knopfler | | 2 | 2:10 | instrument |
| Prelude | Sela | | | 0:39 | instrument |
| Pretty Little Girl | The Chieftains w/ Carolina Chocolate Drops | | | 2:49 | instrument |
| Primordial Breath | Eluveitie | | 4.25 | 4:19 | instrument |
| Primordial Breath | Eluveitie | | | 4:52 | instrument |
| Princess Royal | Jerry O’Sullivan, Paul Cienniwa & Audrey Sabattier-Cienniwa | | | 2:42 | instrument |
| Procession | Nightwish | | 3 | 5:31 | instrument |
| Procession | Mostly Autumn | | | 2:39 | instrument |
| Procession (instrumental) | Nightwish | | | 5:31 | instrument |
| Progressive Waves | Ayreon | | 3 | 3:17 | instrument |
| Prologue | Eluveitie | | 2 | 1:25 | instrument |
| Prologue | Eluveitie | | | 0:43 | instrument |
| Psalm 23 | The Miserable Offenders | | | 4:15 | instrument |
| Psalm 42 / As Longs the Deer | The Miserable Offenders | | | 3:06 | instrument |
| Psalm 96 | Sela | | | 4:54 | instrument |
| Psalm 98 | Sela | | | 3:33 | instrument |
| Puer Natus | LEAH | | | 3:21 | instrument |
| Puer Natus (instrumental) | LEAH | | | 3:23 | instrument |
