| 2005 Nationeal League | |
|---|---|
| League | National Leagues |
| National League One | |
| Champions | Castleford Tigers |
| League leaders | Whitehaven |
| Promotion and relegation | |
| Promoted from National League One | Castleford Tigers |
| Relegated to National League Two | Barrow Raiders Featherstone Rovers |
| National League Two | |
| Promotion and relegation | |
| Promoted from National League Two | York City Knights |
| National League Three | |
| Champions | Coventry Bears |
| League leaders | Bradford Dudley Hill |
The 2005 National Leagues (known as the LHF Healthplan National Leagues due to sponsorship) were the second, third and fourth divisions of rugby league in the UK.