| 'ndiaz | Group | | Bretagne , France | | | | | |
| ][|][ | | | Brest, Finistère, Bretagne , France | | | | | |
| Les 3 Fromages | Group | | France | 2006-04 | Quiberon, Morbihan, Bretagne , France | | | |
| 5 New Cool Girls | Group | | Sarzeau, Morbihan, Bretagne , France | | Sarzeau, Morbihan, Bretagne , France | [unknown] | | |
| 13 Actances | Group | | Brest, Finistère, Bretagne , France | 2001 | | | | |
| 19 Hell | Group | | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| 22 Longs Riffs | Group | | Saint-Brieuc, Côtes-d'Armor, Bretagne , France | 2007-01-01 | Saint-Brieuc, Côtes-d'Armor, Bretagne , France | 2024-09-19 | | |
| 1441 | Person | Male | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| À sa perte | Group | | Rennes, Ille-et-Vilaine, Bretagne , France | 2022 | Rennes, Ille-et-Vilaine, Bretagne , France | | | |
| A‐Sim | Person | Male | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| A.C.O.D.E.T.T.E.A | Person | Female | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| A.N.T.I. | | | Bretagne , France | | | | | |
| A.W.O.L. | Group | | France | 1996 | Rennes, Ille-et-Vilaine, Bretagne , France | 2000 | | |
| Aardmod | Group | | Rennes, Ille-et-Vilaine, Bretagne , France | 2015-01-01 | Rennes, Ille-et-Vilaine, Bretagne , France | | | |
| Ab-Natural | Group | | France | 2017 | Rennes, Ille-et-Vilaine, Bretagne , France | | | |
| Georges Aber | Person | Male | France | 1930-07-17 | Brest, Finistère, Bretagne , France | 2012-03-16 | Plougastel-Daoulas, Finistère, Bretagne , France | |
| Bagad Bro An Aberioù | Orchestra | | France | 1995 | Plabennec, Finistère, Bretagne , France | | | |
| René Abjean | Person | Male | Bretagne , France | 1937-11-22 | Brest, Finistère, Bretagne , France | | | |
| Matthieu Ablain | Person | Male | Belgium | | Fougères, Ille-et-Vilaine, Bretagne , France | | | |
| Abnorm | Group | | Bretagne , France | 2007 | | 2011 | | |
| Abstrackt Keal Agram | Group | | France | 2000 | Morlaix, Finistère, Bretagne , France | | | 5 |
| AC‐Deçus | Group | | Fougères, Ille-et-Vilaine, Bretagne , France | | | | | |
| Acapulco 44 | Group | | Saint-Brieuc, Côtes-d'Armor, Bretagne , France | 2004 | | 2012 | | |
| Adag'nan | Group | | Bretagne , France | 2027 | | | | |
| Adragante | Group | | Saint-Gravé, Morbihan, Bretagne , France | 2008 | | | | |
| adrm | Person | Male | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| Aeiko | Person | | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| AEK Horizon GraphiK | Other | | Finistère, Bretagne , France | | | | | |
| Aezh Morvarc'h | Group | | Bretagne , France | | Bretagne , France | | | |
| AGAV | Person | Male | France | 1989-11-20 | Saint-Brieuc, Côtes-d'Armor, Bretagne , France | | | |
| Ahez | Group | | France | 2018 | Carhaix-Plouguer, Finistère, Bretagne , France | | | |
| Ernest Ahippah | Person | Male | France | 1947-01-15 | Côte d'Ivoire | 2018-03-24 | Bretagne , France | |
| Irène Aïtoff | Person | Female | France | 1904-07-30 | Saint-Cast-le-Guildo, Côtes-d'Armor, Bretagne , France | 2006-06-05 | Paris, Île-de-France, France | |
| Aïwa | Group | | France | 1998 | Ille-et-Vilaine, Bretagne , France | | | |
| Akkma | Person | Male | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| Alban Bauduin | | | Bretagne , France | | | | | |
| Albatross | Group | | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| Alber Jupiter | Group | | Rennes, Ille-et-Vilaine, Bretagne , France | 2017 | Rennes, Ille-et-Vilaine, Bretagne , France | | | |
| Alexy | Person | Male | Vannes, Morbihan, Bretagne , France | | | | | |
| Aline Le Masson | Person | | Bretagne , France | | | | | |
| Philippe Allain-Dupré | Person | Male | France | 1956 | Brest, Finistère, Bretagne , France | | | |
| Sophie Alour | Person | Female | France | 1974-12-24 | Quimper, Finistère, Bretagne , France | | | |
| Alouwassio | Group | | Brest, Finistère, Bretagne , France | | | | | |
| Altokon | Group | | Fougères, Ille-et-Vilaine, Bretagne , France | | | | | |
| ALVAN | Person | Male | Bretagne , France | 1993-03-17 | Lorient, Morbihan, Bretagne , France | | | |
| Amablanc | Group | | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| Amann Rik | Group | | Bretagne , France | | | | | |
| Amari Famili | Group | | Bretagne , France | | | | | |
| Amaury Le Barde | Person | Male | Bretagne , France | | | | | |
| Steve Amber | Group | | Paris, Île-de-France, France | 2015 | Brest, Finistère, Bretagne , France | | | |
| Ampouailh | Group | | Bretagne , France | | | | | |
| An Tec'h | Group | | Bretagne , France | | | | | |
| An Tri Dipop | Group | | Ploërmel, Morbihan, Bretagne , France | | | | | |
| An'so | Person | Female | La Gacilly, Morbihan, Bretagne , France | | | | | |
| Jean-Paul André | Person | Male | France | 1951 | Paimpol, Côtes-d'Armor, Bretagne , France | 2009-09-12 | | |
| Benoît Ange | Person | | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| Giordana Angi | Person | Female | Italy | 1994-01-12 | Vannes, Morbihan, Bretagne , France | | | |
| Adriane Anguis | Person | Female | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| Animatorz | Group | | | 1985 | Rennes, Ille-et-Vilaine, Bretagne , France | | | |
| Madeline Anne | Person | Female | Camaret-sur-Mer, Finistère, Bretagne , France | | | | | |
| Christian Anneix | Person | Male | France | 1950-12 | Rennes, Ille-et-Vilaine, Bretagne , France | | | |
| Antechristus | Group | | Cesson-Sévigné, Ille-et-Vilaine, Bretagne , France | 2001 | | 2005 | | |
| Eugène Anthiome | Person | Male | France | 1836-08-19 | Lorient, Morbihan, Bretagne , France | 1916-07-24 | Étables-sur-Mer, Côtes-d'Armor, Bretagne , France | |
| Antibiotic | Group | | Bretagne , France | | | | | |
| Antoine Pihier | Person | | Bretagne , France | | | | | |
| Appalooza | Group | | France | 2011 | Brest, Finistère, Bretagne , France | | | |
| Aquilonia | Group | | Quimper, Finistère, Bretagne , France | 1994-01 | Quimper, Finistère, Bretagne , France | [unknown] | | |
| AR_original_songs | Person | Male | Pouldergat, Finistère, Bretagne , France | 1976-01-20 | Nantes, Loire-Atlantique, Pays-de-la-Loire, France | | | |
| Ar Bard | | | Bretagne , France | | | | | |
| Dan Ar Braz | Person | Male | France | 1949-01-15 | Bretagne , France | | | |
| Gweltaz Ar Fur | Person | Male | France | 1950-04-25 | Hennebont, Morbihan, Bretagne , France | | | |
| Archipelagos | Group | | France | 2011 | Bretagne , France | | | |
| Ardente | Group | | France | 2020 | Rennes, Ille-et-Vilaine, Bretagne , France | | | |
| Argue | Group | | Lorient, Morbihan, Bretagne , France | 2012 | Lorient, Morbihan, Bretagne , France | | | |
| The Argument | Group | | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| Arhios | Group | | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| Arkaist | Group | | | 2023 | Rennes, Ille-et-Vilaine, Bretagne , France | | | |
| Elliott Armen | Person | Male | France | 1998 | Saint-Malo, Ille-et-Vilaine, Bretagne , France | | | |
| Armst | Person | Male | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| Eric Arnold | Person | Male | Vitré, Ille-et-Vilaine, Bretagne , France | | | | | |
| Philippe Arrii-Blachette | Person | Male | France | 1936-10-20 | Paris, Île-de-France, France | 2023-12-31 | Brest, Finistère, Bretagne , France | |
| Artesia | Group | | France | 2001 | Pleubian, Côtes-d'Armor, Bretagne , France | | | 4.5 |
| Claude Arto | Person | Male | France | | | 2013-08 | Saint-Brieuc, Côtes-d'Armor, Bretagne , France | |
| Philippe Arz | Person | Male | Séné, Morbihan, Bretagne , France | | | | | |
| Asceptic Siliceum | Person | Male | France | 1989-05-17 | Saint-Malo, Ille-et-Vilaine, Bretagne , France | | | |
| Matthieu Aschehoug | Person | Male | France | 1971 | Bretagne , France | | | |
| Astrakan Project | Group | | Plougras, Côtes-d'Armor, Bretagne , France | 2009 | | | | |
| Les Atlas | Group | | | 1962 | Rennes, Ille-et-Vilaine, Bretagne , France | | | |
| Atoem | Group | | Rennes, Ille-et-Vilaine, Bretagne , France | 2017 | | | | |
| Atome | Group | | Bretagne , France | 2016-10 | Morlaix, Finistère, Bretagne , France | | | |
| Atomik Bite | Person | Male | France | | Rennes, Ille-et-Vilaine, Bretagne , France | | | |
| Atr!um | Group | | Rennes, Ille-et-Vilaine, Bretagne , France | | Rennes, Ille-et-Vilaine, Bretagne , France | | | |
| Attic Presence | Group | | Rennes, Ille-et-Vilaine, Bretagne , France | | | | | |
| Marcel Aubé | Person | Male | France | | Brest, Finistère, Bretagne , France | | | |
| Louis Aubert | Person | Male | France | 1877-02-19 | Saint-Malo, Ille-et-Vilaine, Bretagne , France | 1968-01-09 | Paris, Île-de-France, France | |
| Patrick Audouin | Person | Male | Brest, Finistère, Bretagne , France | 1953 | | | | |
| Anne Auffret | Person | Female | France | | Bulat-Pestivien, Côtes-d'Armor, Bretagne , France | | | |
| Gaël Augustin | Person | Male | Bretagne , France | | | | | |
| Michel Aumont | Person | Male | France | 1957 | Caen, Calvados, Normandie , France | 2020-05-31 | Saint-Brieuc, Côtes-d'Armor, Bretagne , France | |
| Autoberceurs | Group | | Bretagne , France | 2020 | | | | |