| J.S. Laboratories | | United States |
| James Telley | | |
| Japanese Productions | | |
| Jar Music | | |
| Jarmusic | | Germany |
| JAV Records | | |
| Jazzical Records | | United States |
| Jazztone | | |
| Jean-Michel Place Editeur | | |
| Jeffrey Norton Publishers | | United States |
| Jelinski / Buttgereit Productions | | |
| Jeremy Bamber Tapes | | Germany |
| Jet Set recordings | | United States |
| Jetset Recordings | | |
| Jettisoundz | | |
| JFK | | United Kingdom |
| Jim Tapes | | United States |
| Jo & Joe Music | | |
| John Doe Recordings | | Canada |
| Johnny Larssen | | |
| Jookie Thrills | | Australia |
| Jordmorkontoret | | |
| Joukkomurha Tapes | | Finland |
| Jovial Milkman Music | | United States |
| Joy Street Studios | | |
| JSL | | |
| JTY Tapes | | United States |
| Jungle Vision Display | | |
| Jurij Bym Produkt | | |
| Just Another Asshole | | United States |
| Just Intonation Network | | |