The 2004 National Leagues ( known as the LHF Healthplan National Leagues due to sponsorship) are the second, third and fourth divisions of rugby league in the UK.
National League One
National League One was won by Leigh Centurions, and won promotion to the Super League after defeating runners-up Whitehaven in the play-off final. Keighley Cougars were relegated to National League Two.
Table
Play-offs
National League Two
National League Two was won by Barrow Raiders, and were automatically promoted to National League One. York City Knights reached the play-off final, but lost to Halifax, who retained their National League One status.
Table
National League Three
National League Three expanded to a 14-team league, but there was still no automatic promotion and relegation with National League Two. The league was won by Coventry Bears, who also went on to win the play-offs.
Table
Play-offs
Week 1
Bradford Dudley Hill 13–30 St Albans Centurions
Coventry Bears 32–26 Birmingham Bulldogs
Sheffield Hillsborough Hawks 38–6 Bramley Buffaloes
Woolston Rovers (Warrington) 36–32 Hemel Stags
Week 2
Sheffield Hillsborough Hawks 26–40 Bradford Dudley Hill
St Albans Centurions 18–26 Bramley Buffaloes
Week 3
Coventry Bears 32–18 Bramley Buffaloes
Woolston Rovers (Warrington) 32–18 Bradford Dudley Hill
Grand Final
Coventry Bears 48–24 Woolston Rovers (Warrington)