| L'A Productions | | |
| L'Age D'or | | Germany |
| L'Agence Des Refusés | | Belgium |
| L'aissez Faire | | Canada |
| L'aissez Faire | | Canada |
| L.A.Y.L.A.H. | | Belgium |
| La Diesis | | |
| La Fondation | | France |
| La Fondation Label | | France |
| La Légende Des Voix | | France |
| La Mamelle Tapes (Audiozine) | | United States |
| La Misère Provoque Le Génie | | |
| La Procédure | | |
| La Sonrisa De Luz | | Argentina |
| Laboratorio De Música Desconocida | | Spain |
| Laboratorios NO | | Spain |
| Labyrinth | | |
| Labyrinth Recordings | | |
| Ladd Frith | | United States |
| Ladd-Frith | | |
| Laddelled Music | | United Kingdom |
| Laissez Faire | | Canada |
| Lama Tapes | | Belgium |
| Land of Yrx Products | | United Kingdom |
| Landmaschienen Tapes | | |
| Landphil Records | | United States |
| Lantaren Venster | | Netherlands |
| Las Cintas Del Fin | | Spain |
| Laton | | Austria |
| Laughing Tapes | | United States |
| Lausch-Label | 1981 | Germany |
| Le Breuvage | | France |
| Le Dernier Cri | | |
| Le Syndicat | | France |
| LeBel PeRIOD | | Netherlands |
| Lebensborn | | |
| Legless Records | | United Kingdom |
| Les Ballets Mécaniques | | France |
| Les Disques Du Crépuscule | | Belgium |
| Les Éditions Intervention | | |
| Les Joyaux De La Princesse | | France |
| Les Mardis De Servin | | France |
| Les Nourritures Terrestres | | France |
| Les Nouvelles Propagandes | | France |
| Les Nouvellse Propagandes | | |
| Les Pages Noires | | Canada |
| Les productions improductives | | France |
| Les Productions Latines | | France |
| Les Variations Ludiques | | France |
| Less Than Zero | | |
| Level | | United States |
| LHA 13 | | |
| Libi Productions | | |
| Light Cone Video | | |
| Lights Out Recordings | | United States |
| Lightwave Productions | | France |
| Likely Tapes | | |
| Likvidér | | Norway |
| Lilit | | Sweden |
| Limbabwe Records | | Netherlands |
| Limusin Label | | |
| Lindau s.r.l. | | |
| Linde Tapes | | Germany |
| Linea Alternativa | | Spain |
| Liquid Produkts | | |
| Lisa Lane Tape | | |
| Litanic D/K | | Germany |
| Literary Tapes | | |
| Literaturlabor Hamburg | | |
| Little Mikey's Noise Factory | | |
| Little Mikeys Noise Factory | | United States |
| Lively Tapes | | United Kingdom |
| Living Art Museum Reykjavik, 1994 | | |
| Llama | | United States |
| LMT | | |
| Lobby Press | | United Kingdom |
| Locust | | |
| Logos Foundation | | Netherlands |
| LOLA | | United Kingdom |
| Lonely Whistle Music | | United States |
| Looking Glas | | |
| Lor Tapes | | |
| Lor Teeps | | Netherlands |
| Los Angeles Free Music Society (LAFMS) | | United States |
| Loser Records | | United States |
| Lost Art | | Germany |
| Lost Records | | |
| Lotus Records | | United Kingdom |
| Lovely Music | | |
| Low Budget Phono Records | | |
| Low Lands Music | | |
| Low Life Cassettes | | |
| Lowest Music and Arts | | Japan |
| LowLife | | United States |
| LSD Records | | Japan |
| LTM | 1983 | United Kingdom |
| Lubricated Records | | |
| Luchterhand | | |
| Lucky Baby Retreat House | | United States |
| Lump in the Rug Tunes | | |