The 2005–06 Northern Premier League season was the 38th in the history of the Northern Premier League, a football competition in England. Teams were divided into two divisions; the Premier and the First.
The Premier Division featured six new clubs:
The Premier Division playoffs saw the second to fifth placed sides in the Division compete for one place in the Conference North.
* After extra time
Division One featured four new clubs:
The First Division playoffs saw the third to sixth placed sides in the First Division compete for a place in the Premier Division.
In the thirty-eighth season of the Northern Premier League Blyth Spartans (as champions) and Farsley Celtic (as play-off winners) were promoted to the Conference North. Wakefield, Bradford Park Avenue and Runcorn Halton were relegated to the First Division; these three clubs were replaced by relegated Conference North side Hednesford Town, First Division winners Mossley, second placed Fleetwood Town and play-off winners Kendal Town. In the First Division Bishop Auckland were relegated and were replaced by Buxton, Cammell Laird, Harrogate Railway Athletic, Alsager Town and Skelmersdale United.
Challenge Cup: Teams from both leagues.
President's Cup: 'Plate' competition for losing teams in the NPL Cup.
Chairman's Cup: 'Plate' competition for losing teams in the NPL Cup.
Peter Swales Shield: Between Champions of NPL Premier Division and Winners of the NPL Cup.
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