| X Communication | | United States |
| X7 Recordings | | United Kingdom |
| Xcentric Noise Records & Tapes | | United Kingdom |
| Xcreteria | | Canada |
| Xenophone International | | Sweden |
| Xerox Sutra Editions | | United States |
| Xerxes | | |
| Xiphotek | | Canada |
| XKAT | | |
| Xkurzhen Sound | | United States |
| Xntrix | | United Kingdom |
| Xpressway 1988 | | New Zealand |