| ¿What Next? Recordings | | United States |
| ŠKUC / Galerija ŠKUC Izdaja | | |
| ÄZNT-Eigenproduktionen | | Germany |
| ä.d.n. | | Spain |
| Æ | | |
| Ådsel Service | | Denmark |
| Zzaj Productions / Luna Bisonte Prods | | United States |
| Zzaj Productions | | United States |
| Zyklus Records | | Germany |
| Zyga | | |
| Zweepslag | | Netherlands |
| Zweckfrei | | Germany |
| ZVC (Zu Viel Cassetten) | | Germany |
| Zukunftsfroh | | |
| ZSF Produkt / ZSF Product | | Japan |
| ZSF Produkt | | Japan |
| ZSF Product/ Discordia Concordia | | |
| Zoi | | Canada |
| Zoar Records | | |
| ZNS Tapes | | Germany |
| Zimbo Tapes | | Netherlands |
| Zimbabwe | | |
| Zidslick | | |
| ZickZack Platten | | Germany |
| Zia Records | | United States |
| ZH27 | | United States |
| ZG Music | | United States |
| Zewa X | | Germany |
| Zeton Productions | | United States |
| Zero Cabal | | Australia |
| Zensor | | |
| Zeiga Recordings | | |
| Zedo & Wz Prod. | | Italy |
| Zeal SS | | United Kingdom |
| ZBS Foundation | | |
| ZBS Adventure Cassettes | | |
| Zark | | |
| Zamizdat Trade Journal | | United States |
| Zaghurim Communications | | United Kingdom |
| Z.N.S. Tapea | | |
| Yura-Kollektif | | Netherlands |
| Yoyo Recordings | | United States |
| Young Idiot Tapes | | |
| You Can't Dance To This One | | United States |
| Yorkopolis | | |
| YLEM | | Japan |
| Yippie Bean | | |
| YHR Tapes / York House Recordings | | United Kingdom |
| Yecch Tapes | | Norway |
| Years on Earth | | United Kingdom |
| Yeah Tape | | Germany |
| YCP | | |
| Überdruß Produkte | | Germany |
| Y.U.R.A. Kollective | | |
| Y Cremlin | | United Kingdom |
| Xpressway 1988 | | New Zealand |
| Xntrix | | United Kingdom |
| Xkurzhen Sound | | United States |
| XKAT | | |
| Xiphotek | | Canada |
| Xerxes | | |
| Xerox Sutra Editions | | United States |
| Xenophone International | | Sweden |
| Xcreteria | | Canada |
| Xcentric Noise Records & Tapes | | United Kingdom |
| X7 Recordings | | United Kingdom |
| X Communication | | United States |
| WW Tapes | | Netherlands |
| Wunderwerke | | Germany |
| Wudu-Mc's | | Germany |
| Wudu MC's | | |
| Wudu | | Germany |
| WSNS | | |
| Writers Forum Cassette | | |
| Wound | | |
| World Wide Terror Music | | |
| World Feedback | | |
| Wooden Soldiers | | |
| Wombats United | | Australia |
| WOMAD Records | | United Kingdom |
| Wolf Rec | | |
| Wizard | | Russian Federation |
| Witchcraft Music | | |
| Witch Tapes | | |
| Wir wollen nur dein bestes Baender | | Germany |
| Windowspeak | | |
| Windmill | | United Kingdom |
| Wildcat Collection | | |
| Widemouth Tapes | | United States |
| Whitewall Tapes | | United States |
| White Stains Tapes | | United Kingdom |
| White Noise | | |
| Whats That Production | | |
| What's That ? | | |
| What's So Funny About | | |
| What 01 | | United Kingdom |
| Whale Tapes | | |
| WGNS Recordings | | |
| WFMU | | United States |
| West Records | | |
