| 2003 LHF Healthplan National League | |
| League: | National League |
| Season: | National League One |
| Season Champs: | Salford City Reds |
| Season Champ Name: | Champions |
| League Leaders: | Salford City Reds |
| League Leaders Name: | League leaders |
| Promote: | Salford City Reds |
| Promote From: | National League One |
| Relegate: | Dewsbury Rams |
| Relegate To: | National League Two |
| Season2: | National League Two |
| Season Champs2: | Keighley Cougars |
| Season Champ Name2: | Champions |
| League Leaders2: | Sheffield Eagles |
| League Leaders Name2: | League leaders |
| Promote2: | Keighley Cougars |
| Promote From2: | National League Two |
| Season3: | National League Three |
| Season Champ Name3: | Champions |
| League Leaders3: | Bradford Dudley Hill |
| League Leaders Name3: | League leaders |
| Prevseason Link: | 2002 Northern Ford Premiership |
| Prevseason Year: | 2002 |
| Nextseason Link: | 2004 Rugby League National Leagues |
| Nextseason Year: | 2004 |
The 2003 National Leagues (known as the LHF National Leagues due to sponsorship) are the second, third and fourth divisions of rugby league played in Britain.
National Leagues One and Two were made up of the 18 clubs that competed in the Northern Ford Premiership during the previous season, plus the London Skolars and the York City Knights. National League Three consisted of ten additional teams from the amateur leagues. There was no automatic promotion and relegation with National League Two, but the RFL hoped to introduce this in the future.
National League One was won by Salford City Reds, and won promotion to the Super League after defeating runners-up the Leigh Centurions in the play-off final. The Dewsbury Rams were relegated to National Two.
National League Two was won by the Sheffield Eagles, but lost to the Keighley Cougars in the play-off final.
National League Three was won by Bradford Dudley Hill, with the play-offs being won by the Woolston Rovers (Warrington).
| Pos | Club | Pld | W | D | L | Pts for | Pts agst | Pts | Qualification |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Bradford Dudley Hill | 14 | 13 | 0 | 1 | 545 | 178 | 26 | Qualifying Semi Final |
| 2 | 14 | 10 | 1 | 3 | 343 | 273 | 21 | ||
| 3 | Woolston Rovers (Warrington) | 14 | 9 | 1 | 4 | 480 | 244 | 19 | Elimination Play-off |
| 4 | St Albans Centurions | 14 | 9 | 0 | 5 | 410 | 284 | 18 | |
| 5 | Sheffield Hillsborough Hawks | 14 | 7 | 1 | 6 | 395 | 246 | 15 | |
| 6 | Underbank Rangers | 14 | 7 | 0 | 7 | 412 | 396 | 14 | |
| 7 | South London Storm | 14 | 6 | 0 | 8 | 274 | 362 | 12 | |
| 8 | Coventry Bears | 14 | 4 | 1 | 9 | 273 | 385 | 9 | |
| 9 | Manchester Knights | 14 | 3 | 0 | 11 | 228 | 584 | 6 | |
| 10 | Hemel Stags | 14 | 0 | 0 | 14 | 160 | 568 | 0 |