| Abbreviation | Definition |
|---|---|
| ACGR | Association Cantonale Genevoise de Rugby |
| ACRA | American Collegiate Rugby Association |
| ACTJRU | Australian Capital Territory Junior Rugby Union |
| AORC | Anglet Olympique Rugby Club |
| APRU | Australian Police Rugby Union |
| AQRT | Amsterdam Quad Rugby Tournament |
| ARFC | Army Rugby Football Club |
| ARFU | Alberta Rugby Football Union |
| ARFU | Asian Rugby Football Union |
| ARFU | Auckland Rugby Football Union |
| ARLC | Australian Rugby League Commission |
| ARPN | Associació de Rugby Poble Nou |
| ARU | Army Rugby Union |
| ARU | Australian Rugby Union |
| AYR | Atlanta Youth Rugby |
| BARA | British Asain Rugby Association |
| BBRU | Blue Bulls Rugby Union |
| BCRL | British Columbia Rugby League |
| BCRU | British Columbia Rugby Union |
| BDR | Ballon de Rugby |