| Current | |
| Keith Fay | Bass (1993-1994), Vocals, Guitars, Banjo, Bodhrán, Bouzouki, Mandolin, Percussion (1993-1997, 1999-present) |
| See also: ex-Crypt, ex-Minas Tirith | |
| Joe Farrell | Drums, Percussion (2000-2007), Bass (2020-present) |
| See also: ex-Celtic Legacy | |
| Tom Woodlock | Drums (2020-present) |
| See also: Zhora | |
| Audrey Trainor | Violin (2020-present) |
| Past | |
| Darryl Conlan | Guitars |
| See also: ex-Minas Tirith | |
| John Clohessy | Bass, Vocals (backing) (1993-1997, 1999-2012) |
| See also: ex-Crypt | |
| Jay O'Neill | Drums, Percussion (1993-1997) |
| See also: ex-Minas Tirith | |
| Steven Anderson | Guitars, Vocals (1993-1994) |
| See also: Venus Sleeps, Yurt, ex-Minas Tirith | |
| John O'Fathaigh | Irish flute, Whistles, Uilleann pipes, Recorder, Bombard, Keyboards, Percussion (1993-1997, 1999-2002, 2003, 2008-2016) |
| See also: ex-Folkodia, ex-Minas Tirith | |
| Leon Bias | Guitars (acoustic), Bouzouki, Mandolin (1994-1995) |
| Collete O'Fathaigh | Keyboards (1994-1995) |
| Jay Brennan | Guitars (1997) |
| Aisling Hanrahan | Vocals (1997) |
| Karen Gilligan | Vocals, Percussion (1999-2008) |
| Ed Gilbert | Banjo, Guitars (acoustic), Keyboards, Tin whistle (2001-2003) |
| John Ryan | Tin whistle (2004-2008), Violin, Bouzouki, Mandocello, Banjo, Keyboards, Vocals (grunts) (2004-2020) |
| See also: ex-Sinister Demise, ex-The Veil (live), ex-Folkodia | |
| Colin Purcell | Drums, Percussion (2007-2012) |
| See also: Vircolac, Sol Axis, ex-Kingdom, ex-Lunar Gate, ex-Dreamsfear | |
| Eric Fletcher | Bass (2012-2018) |
| See also: ex-Nephridium, ex-Evolutions End, ex-Syphor, ex-Primal Dawn | |
| Mauro Frison | Drums (2012-2020) |
| See also: Electric Taurus, Headsic, Misery Oath, Oma Desala, ex-Buffalo, ex-Desert Road, ex-Warbreed, ex-Embodiment, ex-L6B6T6MY, ex-Alternative 4, ex-Huldreslåt | |
| Kieran Ball | Guitars (2012-2020) |
| See also: ex-C.O.L.D., ex-Destroya, ex-Coldblooded | |
| Rustam Shakirzyanov | Bass (2018-2020) |
| See also: Rakoth, Superstatic, Umbral Presence | |
| David Quinn | Guitars (2020-2023) |
| See also: Celtachor, ex-In Memory of..., ex-Laochra, ex-Sacrum of Elegy, ex-Two Tales of Woe | |
| Past (Live) | |
| Maria Antonenko | Vocals |
| See also: ex-Handful of Stars | |
| Ashling Murphy | Vocals (2008-?) |
| Joe Farrell | Drums (2012) |
| See also: ex-Celtic Legacy | |
| Nelly Hanael | Vocals (2014-?) |
| See also: Majesty of Revival (live), ex-Dimitriy Pavlovskiy's PowerSquad | |
| John Clohessy | Bass (2016) |
| See also: ex-Crypt | |
| Keith Fay | Bass (1993-1994), Vocals, Guitars, Banjo, Bodhrán, Bouzouki, Mandolin, Percussion (1993-1997, 1999-present) |
| See also: ex-Crypt, ex-Minas Tirith | |
| Joe Farrell | Drums, Percussion (2000-2007), Bass (2020-present) |
| See also: ex-Celtic Legacy | |
| Tom Woodlock | Drums (2020-present) |
| See also: Zhora | |
| Audrey Trainor | Violin (2020-present) |
| Darryl Conlan | Guitars |
| See also: ex-Minas Tirith | |
| John Clohessy | Bass, Vocals (backing) (1993-1997, 1999-2012) |
| See also: ex-Crypt | |
| Jay O'Neill | Drums, Percussion (1993-1997) |
| See also: ex-Minas Tirith | |
| Steven Anderson | Guitars, Vocals (1993-1994) |
| See also: Venus Sleeps, Yurt, ex-Minas Tirith | |
| John O'Fathaigh | Irish flute, Whistles, Uilleann pipes, Recorder, Bombard, Keyboards, Percussion (1993-1997, 1999-2002, 2003, 2008-2016) |
| See also: ex-Folkodia, ex-Minas Tirith | |
| Leon Bias | Guitars (acoustic), Bouzouki, Mandolin (1994-1995) |
| Collete O'Fathaigh | Keyboards (1994-1995) |
| Jay Brennan | Guitars (1997) |
| Aisling Hanrahan | Vocals (1997) |
| Karen Gilligan | Vocals, Percussion (1999-2008) |
| Ed Gilbert | Banjo, Guitars (acoustic), Keyboards, Tin whistle (2001-2003) |
| John Ryan | Tin whistle (2004-2008), Violin, Bouzouki, Mandocello, Banjo, Keyboards, Vocals (grunts) (2004-2020) |
| See also: ex-Sinister Demise, ex-The Veil (live), ex-Folkodia | |
| Colin Purcell | Drums, Percussion (2007-2012) |
| See also: Vircolac, Sol Axis, ex-Kingdom, ex-Lunar Gate, ex-Dreamsfear | |
| Eric Fletcher | Bass (2012-2018) |
| See also: ex-Nephridium, ex-Evolutions End, ex-Syphor, ex-Primal Dawn | |
| Mauro Frison | Drums (2012-2020) |
| See also: Electric Taurus, Headsic, Misery Oath, Oma Desala, ex-Buffalo, ex-Desert Road, ex-Warbreed, ex-Embodiment, ex-L6B6T6MY, ex-Alternative 4, ex-Huldreslåt | |
| Kieran Ball | Guitars (2012-2020) |
| See also: ex-C.O.L.D., ex-Destroya, ex-Coldblooded | |
| Rustam Shakirzyanov | Bass (2018-2020) |
| See also: Rakoth, Superstatic, Umbral Presence | |
| David Quinn | Guitars (2020-2023) |
| See also: Celtachor, ex-In Memory of..., ex-Laochra, ex-Sacrum of Elegy, ex-Two Tales of Woe | |
| Past | |
| Maria Antonenko | Vocals |
| See also: ex-Handful of Stars | |
| Ashling Murphy | Vocals (2008-?) |
| Joe Farrell | Drums (2012) |
| See also: ex-Celtic Legacy | |
| Nelly Hanael | Vocals (2014-?) |
| See also: Majesty of Revival (live), ex-Dimitriy Pavlovskiy's PowerSquad | |
| John Clohessy | Bass (2016) |
| See also: ex-Crypt | |
Cruachan formed as a result of the disbandment of a previous band called Minas Tirith. They disbanded in mid-1997 but reformed in January 1999.
Cruachan's earlier works were more influenced by black metal. Since reforming they became more melodic, with Karen Gilligan joining ...