The 2003–04 Northern Premier League season was the 36th in the history of the Northern Premier League, a football competition in England. Teams were divided into two divisions; the Premier and the First. This season was the last before the formation of the Conference North and the Conference South, so most of the Premier Division teams were promoted to the Conference North for next season. Subsequently, the First Division had most of its teams promoted to the Premier Division, with new teams admitted from the leagues just below the Northern Premier in the English football league system, although the league reform meant that the "promoted" clubs remained in the same tier within the English football league system, and further meant that while there was no relegation within the NPL itself, those clubs that missed out on promotion nevertheless had their position within the league system downgraded by one tier. During this season, Radcliffe Borough's Jody Banim broke the English record for the most consecutive games where a player has scored at least one goal, which ran from 9 September to 4 November.

Premier Division

The Premier Division featured four new teams:

League table

Results

Play-offs

Eight teams competed for the final Conference North place; including Hyde United, champions of Division One.

Division One

Division One featured five new teams:

League table

Results

Promotion and relegation

In the thirty-sixth season of the Northern Premier League the top fourteen teams of the Premier Division plus Bradford Park Avenue were promoted to the newly formed Conference North. They were replaced by the top fourteen teams of the First Division, who in turn were replaced by the following fourteen teams: While no teams were relegated this season, the league reform meant the teams that missed out on "promotion" remained in a league that had its position in the English football league system downgraded by one tier while the "promoted" teams actually remained on the same level of the league system.

Cup results

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.