London 3 South East
London 3 South East is an English level 8 Rugby Union League involving club sides from Kent, East Sussex, West Sussex and the south-east London. It is made up of teams predominantly from London, Sussex and Kent. The twelve teams play home and away matches from September through to April. Each year all clubs in the division also take part in the RFU Senior Vase - a level 8 national competition.
Promoted teams move up to London 2 South East and demoted teams move to Sussex Spitfire 1 and Shepherd Neame Kent 1. Although 2nd XV rugby is part of the Sussex regional system, only 1st XV sides can play in London 3 South East.
Teams for 2019–20
| Team | Ground | Capacity | City/Area | Previous season |
| Ashford | Kinney's Field | Ashford, Kent | Promoted from Kent 1 | |
| Aylesford Bulls | Jack Williams Ground | Aylesford, Kent | Relegated from London 2 SE | |
| Bromley | Barnet Wood Road | Hayes, London | 9th | |
| Folkestone | New Burlington Ground | Newington, Folkestone, Kent | 3rd | |
| Gillingham Anchorians | Darland Banks | Gillingham, Kent | Promoted from Kent 1 | |
| Heathfield & Waldron | Hardy Roberts Recreational Ground | Cross In Hand, Heathfield, East Sussex | Relegated from London 2 SE | |
| Old Dunstonians | St. Dunstan's Lane | Beckenham, London | 6th | |
| Old Williamsonians | Sir Joseph Williamson's Mathematical School | Rochester, Kent | 8th | |
| Park House | Barnet Wood Road | Hayes, London | 7th | |
| Pulborough | Freelands | Pulborough, West Sussex | 4th | |
| Uckfield | Hempstead Playing Fields | Uckfield, East Sussex | Promoted from Sussex 1 | |
| Vigo | Swanswood Field | Vigo, Kent | 5th |
Teams for 2018–19
| Team | Ground | Capacity | City/Area | Previous season |
| Beccehamian | Sparrow's Den | West Wickham, London | Promoted from Kent 1 | |
| Bromley | Barnet Wood Road | Hayes, London | 3rd | |
| Crowborough | Steel Cross | Crowborough, East Sussex | 6th | |
| Folkestone | New Burlington Ground | Newington, Folkestone, Kent | 10th | |
| Hastings & Bexhill | William Parker Lower School | Hastings, East Sussex | 9th | |
| Lewes | Stanley Turner Ground | Lewes, East Sussex | 7th | |
| Old Dunstonians | St. Dunstan's Lane | Beckenham, London | 5th | |
| Old Williamsonians | Sir Joseph Williamson's Mathematical School | Rochester, Kent | 4th | |
| Park House | Barnet Wood Road | Hayes, London | 8th | |
| Pulborough | Freelands | Pulborough, West Sussex | Relegated from London 2 SE | |
| Vigo | Swanswood Field | Vigo, Kent | Promoted from Kent 1 |
Teams for 2017–18
| Team | Ground | Capacity | City/Area | Previous season |
| Aylesford Bulls | Jack Williams Ground | Aylesford, Kent | 7th | |
| Bromley | Barnet Wood Road | Hayes, London | Relegated from London 2 South East | |
| Crawley | Willoughby Fields | Crawley, West Sussex | Promoted from Sussex 1 | |
| Crowborough | Green Lane | Crowborough, East Sussex | Relegated from London 2 South East | |
| Folkestone | New Burlington Ground | Newington, Folkestone, Kent | 4th | |
| Hastings & Bexhill | William Parker Lower School | Hastings, East Sussex | Promoted from Kent 1 | |
| Lewes | Stanley Turner Ground | Lewes, East Sussex | 5th | |
| Old Dunstonians | St. Dunstan's Lane | Beckenham, London | 6th | |
| Old Williamsonians | Sir Joseph Williamson's Mathematical School | Rochester, Kent | Promoted from Kent 1 | |
| Park House | Barnet Wood Road | Hayes, London | 9th | |
| Sheppey | Stupple Field | Minster, Kent | 8th | |
| Thanet Wanderers | St Peter's Recreation Ground | Broadstairs, Kent | 3rd |
Teams for 2016-17
- Ashford '
- Aylesford Bulls
- Eastbourne
- Folkestone
- Gillingham Anchorians
- Haywards Heath '
- Lewes '
- Old Dunstonians
- Park House
- Pulborough
- Sheppey '
- Thanet Wanderers
Teams for 2015-16
- Aylesford Bulls '
- Bromley
- Burgess Hill '
- Cranbrook '
- Eastbourne '
- Folkestone
- Gillingham Anchorians
- Heathfield & Waldron
- Old Dunstonians
- Park House
- Pulborough
- Uckfield
Teams for 2014-15
- Bromley
- Dartfordians
- Folkestone
- Gillingham Anchorians
- Hastings & Bexhill
- Heathfield & Waldron '
- Horsham
- Lewes '
- Old Dunstonians
- Park House
- Pulborough
- Uckfield
Teams for 2013-14
- Ashford
- Beccehamian '
- Bromley
- Burgess Hill '
- Dartfordians
- Folkestone
- Gillingham Anchorians
- Horsham
- Old Dunstonians
- Sheppey
- Thanet Wanderers
- Uckfield
Teams for 2012-2013
- Ashford
- Bromley
- Folkestone
- Gillingham Anchorians
- Horsham
- Maidstone
- Park House
- Pulborough
- Sheppey
- Tunbridge Wells
- Uckfield
- Vigo
London 3 South East Honours
Number of league titles
- Aylesford Bulls
- Crowborough
- Ashford
- Betteshanger
- Bognor
- Bromley
- Chichester
- Dartfordians
- East Grinstead
- Eastbourne
- Heathfield & Waldron
- Horsham
- Maidstone
- Old Dunstonians
- Old Elthamians
- Pulborough
- Thanet Wanderers
- Tonbridge Juddians