| Abbreviation | Definition |
|---|---|
| IWA | Internet Wrestling Alliance |
| IWAU | Independent Wrestling Association Unlimited |
| IWC | International Wrestling Cartel |
| IWC | International Wrestling Council |
| IWC | Internet Wrestling Community |
| IWE | Independent Wrestling Entertainment |
| IWE | International Wrestling Enterprise |
| IWE | International Wrestling Entertainment |
| IWF | Independent Wrestling Federation |
| IWF | International Wrestling Federation |
| IWF | Internet Wrestling Federation |
| IWGP | International Wrestling Gran Prix |
| IWGP | International Wrestling Grand Prix |
| IWL | Insane Wrestling League |
| IWL | International Wrestling League |
| IWO | Internal Wrestling Organization |
| IWO | Internet Wrestling Organization |
| IWR | Imperial Wrestling Revolution |
| IWR | Insane Wrestling Revolution |
| IWS | International Wrestling Syndicate |