1990–91 National Division 1
The 1990–91 National Division 1 was the fourth season of the top tier of the English rugby union league system, the Courage Clubs Championship, currently known as Premiership Rugby. Wasps were the defending champions and Northampton and Liverpool St Helens the promoted sides.
Bath finished the season the champions for the second time, beating the holders Wasps by just one point. The two bottom sides, Moseley and Liverpool St Helens, were relegated to the 1991–92 National Division 2.
Structure
The division increased from twelve teams to thirteen, each side playing the others once to make a total of twelve matches each. The bottom two teams would be relegated to National Division 2.Participating teams
| Team | Stadium | Capacity | City/Area | Previous season |
| Bath | Recreation Ground | 8,300 | Bath, Somerset | 3rd |
| Bristol | Memorial Stadium | 8,500 | Bristol, Avon | 9th |
| Gloucester | Kingsholm | 11,100 | Gloucester, Gloucestershire | 2nd |
| Harlequins | The Stoop | 9,000 | Twickenham, London | 7th |
| Leicester | Welford Road | 14,700 | Leicester, Leicestershire | 5th |
| Liverpool St Helens | Moss Lane | 4,370 | St Helens, Merseyside | Promoted from National 2 |
| Moseley | The Reddings | 9,999 | Birmingham, West Midlands | 11th |
| Northampton | Franklin's Gardens | 6,000 | Northampton, Northamptonshire | Promoted from National 2 |
| Nottingham | Ireland Avenue | 4,990 | Beeston, Nottinghamshire | 6th |
| Orrell | Edge Hall Road | 5,300 | Orrell, Greater Manchester | 8th |
| Rosslyn Park | The Rock | 4,630 | Roehampton, London | 10th |
| Saracens | Bramley Road | 2,300 | Enfield, London | 4th |
| Wasps | Repton Avenue | 3,200 | Sudbury, London | Champions |
Results
The home team is listed in the left column.Fixtures & Results
Round 8
Round 13
- Bath are champions.