The 1983–84 Northern Premier League season was the 16th in the history of the Northern Premier League, a football competition in England.
The League featured twenty-two clubs.
The following four clubs left the League at the end of the previous season: The following four clubs joined the League at the start of the season: Challenge Cup: President's Cup: Northern Premier League Shield: Between Champions of NPL Premier Division and Winners of the NPL Cup.
At the end of the sixteenth season of the Northern Premier League, Barrow applied to join the Alliance Premier League and were successful.
The following club left the League at the end of the season: The following club joined the League the following season: