Counties 2 Kent (formerly 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. The twelve teams play home and away matches from September to April. Following the RFU's Adult Competition Review, from season 2022-23 it adopted its current name Counties 2 Kent. Promoted teams move up to Counties 1 Kent. Relegated teams drop down to Counties 3 Kent.

Teams for 2024-25

Departing were Sevenoaks II and Park House promoted to Counties 1 Kent. Old Dunstonians were relegated to Counties 3 Kent. Joining were Thanet Wanderers, relegated from Counties 1 Kent together with Old Alleynians II and Old Elthamians, both promoted from Counties 3 Kent.

Teams for 2023-24

Departing were Canterbury II and Dover promoted to Counties 1 Kent as joint champions. Southwark Lancers were relegated and moved on a level transfer to Counties 4 Surrey whilst Hastings & Bexhill were relegated to Counties 3 Kent. Joining were Folkestone and Aylesford Bulls, both relegated from Counties 1 Kent together with Dartford Valley and Medway II, both promoted from Counties 3 Kent.

Teams for 2022-23

This was the first season following the RFU Adult Competition Review with the league adopting its new name of Counties 2 Kent. Returning were 6 of the 12 teams who competed in the previous season's league. Departing were Bromley, Aylesford Bulls, Cranbrook and Heathfield & Waldron, all promoted to Counties 1 Kent. Also leaving on a level transfer to Counties 2 Sussex were Pulborough (10th) and Crawley (12th). Joining were Hastings & Bexhill and Park House, both promoted. There were also new entries with the 2XVs from Sidcup, Canterbury, Sevenoaks and Westcombe Park added.

Teams for 2021–22

The teams competing in 2021-22 season earned their places in the league based on their performances in the 2019-20, Thus, the 'previous season' column in the table below refers to the 2019-20 season, not the 2020-21 season.

Season 2020–21

On 30 October 2020 the RFU announced that due to the coronavirus pandemic a decision had been taken to cancel Adult Competitive Leagues (National League 1 and below) for the 2020/21 season meaning London 3 South East was not contested.

Teams for 2019–20

Teams for 2018–19

Teams for 2017–18

Teams for 2016-17

Teams for 2015-16

Teams for 2014-15

Teams for 2013-14

Teams for 2012-2013

Original teams

When this division was introduced in 2000 (as London 4 South East) it contained the following teams:

London 3 South East honours

London 4 South East (2000–2009)

Originally known as London 4 South East, this division was a tier 8 league with promotion up to London 3 South East and relegation down to either Kent 1 or Sussex 1.

London 3 South East (2009–present)

League restructuring by the RFU ahead of the 2009–10 season saw London 4 South East renamed as London 3 South East. Remaining as a tier 8 league promotion was to London 2 South East (formerly London 3 South East), while relegation continued to either Kent 1 or Sussex 1.

Number of league titles