Counties 1 Middlesex
Counties 1 Middlesex is a level 7 Rugby Union league with teams from North-West London taking part. Historically the league was a level 10 completion and the division was cancelled at the end of the 1995–96 campaign after nine seasons due to the merger of the Hertfordshire and Middlesex regional leagues. After nearly 20 years, ahead of the 2025-26 season the league was re-instated as a decision was taken to once more split out Hertfordshire RFU and Middlesex RFU clubs.
Promoted teams typically move up to Regional 2 Thames and relegated sides move down to Counties 2 Middlesex.
Participating clubs 2025–26
This was the first season in which Hertfordshire RFU and Middlesex RFU clubs were split out with the Hertfordshire RFU teams remaining in what was Counties 1 Herts/Middlesex and became Counties 1 Hertfordshire.Teams in this league came on a level transfer from Counties 1 Herts/Middlesex or were drawn up from Counties 2 Hert/Middlesex.
| Team | Ground | Capacity | City/Area | Previous season |
| Chiswick | Dukes Meadows | Chiswick, London | Level transfer from Counties 1 Herts/Middlesex | |
| Ealing Trailfinders 1871 | Trailfinders Sports Ground | 4,000 | West Ealing, London | Level transfer from Counties 1 Herts/Middlesex |
| Finchley | Summers Lane | 1,000 | Finchley, London | Level transfer from Counties 1 Herts/Middlesex |
| Hampstead | Parliament Hill Fields | Highgate, London | Promoted from Counties 2 Herts/Middlesex | |
| Old Haberdashers | Croxdale Road | Borehamwood, Hertfordshire | Relegated from Regional 2 Thames | |
| Old Streetonians | Haggerston Park | Shoreditch, London | Level transfer from Counties 1 Herts/Middlesex | |
| Ruislip | West End Road | Ruislip, London | Level transfer from Counties 1 Herts/Middlesex | |
| Saracens Amateurs | Bramley Sports Ground | Cockfosters, London | Promoted from Counties 2 Herts/Middlesex | |
| UCS Old Boys | UCS Sports Ground | Cricklewood, London | Promoted from Counties 2 Herts/Middlesex | |
| Wasps FC | Twyford Avenue Sports Ground | Acton, London | Promoted from Counties 2 Herts/Middlesex |
1996–2025
Not contestedOriginal teams
When league rugby began in 1987 this division contained the following teams:- Finchley
- Hampstead
- Lensbury
- London New Zealand
- Old Haberdashers
- Old Meadonians
- Old Millhillians
- Orleans FP
- Staines
- Sudbury Court
- Uxbridge
Middlesex 1 honours
Middlesex 1 (1987–1992)
The original Middlesex 1 was a tier 8 league with promotion up to London 3 North West and relegation down to Middlesex 2.Middlesex 1 (1992–1996)
The creation of Herts/Middlesex at the beginning of the 1992–93 season meant that Middlesex 1 dropped to become a tier 9 league. The introduction of National 5 South for the 1993–94 season meant that Middlesex 1 dropped another level to become a tier 10 league for the years that National 5 South was active. Promotion was into the new Herts/Middlesex league while relegation continued into Middlesex 2. The merging of the Hertfordshire and Middlesex regional divisions at the end of the 1995–96 season meant that Middlesex 1 was cancelled.Number of league titles
- Finchley
- Hackney
- Hampstead
- Lensbury
- Mill Hill
- Old Hamptonians
- Staines
- Twickenham
- Uxbridge