| Abbreviation | Definition |
|---|---|
| MRRC | Mystic River Rugby Club |
| MRSC | Munster Rugby Supporters Club |
| MRU | Malaysia Rugby Union |
| NEACB | Not Even Ah Cuzzy Broq |
| NHRU | Newcastle and Hunter Rugby Union |
| NRCA | National Rugby Centre Amsterdam |
| NRL | National Rugby League |
| NRL | NRL Rugby League |
| NRL | Nsw Rugby League |
| NRL | Rugby league |
| NRLB | Nederlandse Rugby League Bond |
| NTRL | Northern Territory Rugby League |
| NTRS | Nishi Tokyo Rugby School |
| NZR | New Zealand Rugby |
| NZRL | New Zealand Rugby League |
| NZRU | New Zealand Rugby Union |
| ORFU | Ontario Rugby Football Union |
| ORRA | Otago Rugby Referees Association |
| ORSU | Oregon Rugby Sports Union |
| ORU | Ontario Rugby Union |