2007 National League One
The league was televised live for the first time following a deal with the broadcaster Sky Sports.
Castleford Tigers were relegated from the Super League in 2006, while Dewsbury Rams and Sheffield Eagles gained promotion from National League Two. York City Knights and Oldham R.L.F.C. are relegated to National League Two.
National League Three was abolished for the 2007 season and rebranded as the Rugby League Conference National division.
National League One
Table
| Team finishing top of the table, earning the League Leaders Shield | |
| Teams qualifying for the Play-offs | |
| Teams in relegation position |
- Rochdale and Doncaster relegated to National League Two for 2008.
- Doncaster deducted 6 points due to entering administration.
Playoffs
Week One.
- Whitehaven beat Leigh .
- Halifax beat Sheffield .
- Castleford beat Widnes .
- Halifax beat Whitehaven .
- Widnes beat Halifax .
- Castleford Tigers 42 - 10 Widnes Vikings. Match played at neutral venue Headingley Stadium.