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

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.

Pos	Team	Pld	W	D	L	PF	PA	PD	Pts	Qualification
1	Salford City Reds (P)	18	14	2	2	443	438	+5	30	Semi-final
2	Leigh Centurions	18	15	0	3	702	309	+393	30
3	Rochdale Hornets	18	13	0	5	647	477	+170	26	Elimination Semi-final
4	Hull Kingston Rovers	18	10	0	8	401	373	+28	20
5	Oldham	18	7	2	9	404	500	−96	16
6	Whitehaven	18	5	5	8	683	398	+285	15
7	Featherstone Rovers	18	7	0	11	387	478	−91	14
8	Doncaster Dragons	18	6	1	11	429	632	−203	13
9	Batley Bulldogs	18	5	1	12	366	543	−177	11
10	Dewsbury Rams (R)	18	2	1	15	284	751	−467	5	Relegated to National League Two

Playoffs

	Elimination play-offs					Qualifying/Elimination semifinal					Elimination final					Grand Final
						The Willows										Halton Stadium
						1	Salford	26								Salford		31
						2	Leigh Centurions	18			Leigh Sports Village					Leigh Centurions		14
	Spotland
											Leigh Centurions		42
	3	Rochdale	40
						Spotland					Hull KR		12
	6	Whitehaven	38
						Rochdale		26
	Craven Park
						Hull KR		30
	4	Hull KR	38
	5	Oldham	24

Grand Final

National League Two

National League Two was won by the Sheffield Eagles, but lost to the Keighley Cougars in the play-off final.

Pos	Team	Pld	W	D	L	PF	PA	PD	Pts	Qualification
1	Sheffield Eagles	18	13	0	5	644	326	+318	26	Semi-final
2	Chorley Lynx	18	13	0	5	584	362	+222	26
3	Keighley Cougars (P)	18	13	0	5	488	340	+148	26	Elimination Semi-final
4	York City Knights	18	11	1	6	576	381	+195	23
5	Barrow Raiders	18	11	0	7	546	419	+127	22
6	Hunslet Hawks	18	10	1	7	513	425	+88	21
7	Swinton Lions	18	8	1	9	445	426	+19	17
8	Workington Town	18	4	1	13	393	558	−165	9
9	Gateshead Thunder	18	3	1	14	365	663	−298	7
10	London Skolars	18	1	1	16	222	876	−654	3

Playoffs

	Elimination play-offs					Qualifying/Elimination semifinal					Elimination final					Grand Final
						Don Valley Stadium										Halton Stadium
						1	Sheffield	31								Keighley		13
						2	Chorley	14			Bloomfield Road					Sheffield		11
	Cougar Park
											Chorley		12
	3	Keighley	25
						Cougar Park					Keighley		45
	6	Hunslet	12
						Keighley		35
	Bootham Crescent
						Barrow		26
	4	York	30
	5	Barrow	50

Grand Final

National League Three

National League Three was won by Bradford Dudley Hill, with the play-offs being won by the Woolston Rovers (Warrington).

Table

Playoffs