London 3 North West
London 3 North West is a level 8 league within the RFU league structure and is made up of teams predominantly from north-west London and Hertfordshire. Promoted sides tend to move up to London 2 North West while relegated teams drop to Herts/Middlesex 1. Each year all clubs in the division also take part in the RFU Senior Vase - a level 8 national competition.
Participating Clubs 2019–20
| Team | Ground | Capacity | City/Area | Previous season |
| Cheshunt | Rosedale Sports Club | Cheshunt, Hertfordshire | 8th | |
| Enfield Ignatians | Donkey Lane | Enfield Town, London | Relegated from London 2 NW | |
| Finchley | Summers Lane | 1,000 | Finchley, London | 10th |
| Finsbury Park | Downhills Park | West Green, London | Promoted from Herts/Middlesex 1 | |
| Harrow | Grove Field | Stanmore, London | 7th | |
| Hitchin | King George V Playing Fields | Hitchin, Hertfordshire | Promoted from Herts/Middlesex 1 | |
| Kilburn Cosmos | Gladstone Park | Kilburn, London | 9th | |
| Old Merchant Taylors' | War Memorial Sports Ground | Northwood, London | 6th | |
| Old Streetonians | Haggerston Park | Shoreditch, London | 4th | |
| Royston | The Heath Sports Centre | Royston, Hertfordshire | 11th | |
| Stevenage Town | North Road | Stevenage, Hertfordshire | 3rd | |
| Tabard | Cobden Hill | Radlett, Hertfordshire | 5th |
Participating Clubs 2018–19
| Team | Ground | Capacity | City/Area | Previous season |
| Cheshunt | Rosedale Sports Club | Cheshunt, Hertfordshire | 10th | |
| Datchworth | Datchworth Sports Club | Datchworth, Hertfordshire | 8th | |
| Finchley | Summers Lane | 1,000 | Finchley, London | 7th |
| Harrow | Grove Field | Stanmore, London | Relegated from London 2 NW | |
| Kilburn Cosmos | Gladstone Park | Kilburn, London | 6th | |
| London Welsh | Old Deer Park | 5,850 | Richmond, London | Promoted from Herts/Middlesex 1 |
| Old Merchant Taylors' | War Memorial Sports Ground | Northwood, London | 9th | |
| Old Streetonians | Haggerston Park | Shoreditch, London | 4th | |
| Royston | The Heath Sports Centre | Royston, Hertfordshire | Promoted from Herts/Middlesex 1 | |
| Stevenage Town | North Road | Stevenage, Hertfordshire | 3rd | |
| Tabard | Cobden Hill | Radlett, Hertfordshire | Relegated from London 2 NW | |
| Verulamians | Cotlandswick | London Colney, Hertfordshire | 5th |
Participating Clubs 2017–18
| Team | Ground | Capacity | City/Area | Previous season |
| Cheshunt | Rosedale Sports Club | Cheshunt, Hertfordshire | 10th | |
| Datchworth | Datchworth Sports Club | Datchworth, Hertfordshire | 6th | |
| Finchley | Summers Lane | 1,000 | Finchley, London | 11th |
| Grasshoppers | MacFarlane Lane | Isleworth, London | 4th | |
| Hitchin | King George V Playing Fields | Hitchin, Hertfordshire | 8th | |
| Kilburn Cosmos | Gladstone Park | Kilburn, London | 5th | |
| Old Merchant Taylors' | War Memorial Sports Ground | Northwood, London | 9th | |
| Old Streetonians | Haggerston Park | Shoreditch, London | Promoted from Herts/Middlesex 1 | |
| St Albans | Boggymead Springs | St Albans, Hertfordshire | 7th | |
| Stevenage Town | North Road | Stevenage, Hertfordshire | 3rd | |
| Verulamians | Cotlandswick | London Colney, St Albans, Hertfordshire | Promoted from Herts/Middlesex 1 | |
| Welwyn | Hobbs Way | Welwyn Garden City, Hertfordshire | Relegated from London 2 North West |
Participating Cubs 2016-17
- Cheshunt '
- Datchworth
- Finchley
- Grasshoppers
- Hackney
- Hemel Hempstead
- Hitchin
- Kilburn Cosmos '
- Old Merchant Taylors' '
- St Albans
- Staines '
- Stevenage Town
Final league table
Participating Clubs 2015-16
- Belsize Park
- Datchworth
- Finchley
- Grasshoppers
- Hackney
- Hemel Hempstead '
- Hitchin
- London Nigerian '
- Old Actonians '
- St Albans '
- Stevenage Town
- Wasps
Participating Clubs 2014-15
- Belsize Park '
- Datchworth
- Finchley
- Fullerians
- Grasshoppers
- Hackney '
- Hitchin
- Old Streetonians
- Stevenage Town
- U.C.S. Old Boys
- Wasps
- Welwyn
Participating Clubs 2013-14
- Datchworth
- Finchley
- Fullerians '
- Grasshoppers '
- Harrow '
- Hitchin
- London New Zealand
- Old Merchant Taylors' '
- Old Streetonians '
- Stevenage Town '
- Wasps
- Welwyn
Participating Clubs 2012-13
- Barnet Elizabethans
- Cheshunt
- Datchworth
- Finchley
- Haringey Rhinos
- Hitchin
- Imperial Medicals
- London New Zealand
- Old Priorians
- Twickenham
- Wasps
- Welwyn
Participating Clubs 2009-10
- Bank of England
- Barnet Elizabethans
- Cheshunt
- Datchworth
- Fullerians
- Haringey Rhinos
- Hitchin
- Old Ashmoleans
- Old Hamptonians
- Old Streetonians
- West London
London 3 North West Honours
Number of league titles
- Old Streetonians
- Chiswick
- Civil Service
- Finchley
- Fullerians
- Grasshoppers
- Hackney
- Hammersmith & Fulham
- Harrow
- H.A.C.
- Letchworth Garden City
- London New Zealand
- London Nigerian
- London Scottish
- London Welsh
- Old Haberdashers
- Old Priorians
- Tring
- Welwyn