1990–91 Courage National 4 North
The 1990–91 Courage National 4 North was the fourth full season of rugby union within the fourth tier of the English league system, currently known as National League 2 North, and counterpart to the Courage National 4 South. It was the first season for the division using the name National 4 North, having been known as Area League North the previous year. The league champions were newly promoted Otley who comfortably achieved their second successive promotion, this time to the 1991–92 National Division 3, five points clear of runners up Lichfield.
At the other end of the table, Birmingham & Solihull and Stoke-on-Trent and were the two sides to be relegated. For Birmingham & Solihull fans it was a familiar story, as previous incarnations of the club had already been relegated from the division. Both sides would drop to Midlands 1.
Structure
Each team played one match against each of the other teams, playing a total of ten matches each. The champions are promoted to National Division 3 and the bottom team was relegated to either North 1 or Midlands 1 depending on their locality.Participating teams and locations
| Team | Ground | Capacity | City/Area | Previous Season |
| Birmingham & Solihull | Sharmans Cross | 2,500 | Solihull, West Midlands | Promoted from Midlands 1 |
| Durham City | Hollow Drift | Durham, County Durham | 4th | |
| Kendal | Mint Bridge | 3,000 | Kendal, Cumbria | 5th |
| Harrogate | Claro Road | Harrogate, North Yorkshire | Promoted from North 1 | |
| Hereford | Wyeside | Hereford, Herefordshire | Promoted from Midlands 1 | |
| Lichfield | Cooke Fields | Lichfield, Staffordshire | 7th | |
| Northern | McCracken Park | 1,000 | Newcastle upon Tyne, Tyne and Wear | 8th |
| Otley | Cross Green | 5,000 | Otley, West Yorkshire | Promoted from North 1 |
| Preston Grasshoppers | Lightfoot Green | 5,000 | Preston, Lancashire | 6th |
| Stoke-on-Trent | Hartwell Lane | Barlaston, Staffordshire | 11th | |
| Stourbridge | Stourton Park | 3,000 | Stourbridge, West Midlands | 3rd |
| Walsall | Broadway | 1,150 | Walsall, West Midlands | 10th |
| Winnington Park | Burrows Hill | Norwich, Cheshire | 9th |