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| Sport | Rugby union |
|---|---|
| Instituted | 2017 |
| Number of teams | 12 |
| Country |  England |
| Holders | Chelmsford (1st title) (2019–20) (promoted to London 2 North East) |
| Most titles | Basildon, Chelmsford, Epping Upper Clapton (1 title) |
| Website | englandrugby.com |
London 3 Essex was an English rugby union league at the eighth level of the English rugby union system and was available to club sides based in Essex and north-east London. Promoted teams moved up to London 2 North East with league champions going up automatically and the runners up playing a playoff against the runners up from London 3 Eastern Counties, while demoted teams usually dropped down to Essex Canterbury Jack 1, with new teams also coming up from this league. Each year all clubs in the division also took part in the RFU Senior Vase – a level 8 national competition.
The division was created for the 2017–18 season as part of an RFU reorganization of the London & South East regional league. Originally there had been a London 3 North East league which had involved teams from Essex and north-east London along with teams from the Eastern Counties (Cambridgeshire, Norfolk and Suffolk). Due to the distances involved for teams travelling potentially from London to Norfolk and vice versa, at the end of the 2016–17 season this league was discontinued. Teams in Essex and north-east London who had played in London 3 North East were transferred into the new look London 3 Essex along with additional promoted teams from the Essex regional leagues, while the Eastern Counties sides went into another new division called London 3 Eastern Counties.
Following the Rugby Football Union's Adult Competition Review, the league's place in the English rugby union system was taken by Counties 1 Essex, with the teams placed 1st to 10th in 2021–22 London 3 Essex making up the new league.