Counties 5 Kent (formerly Kent 3) is an English Rugby Union league that is the lowest RFU league for clubs in south-east London and Kent. Promoted teams go up to Counties 4 Kent and relegation is to the Kent RFU merit leagues.
Dwindling numbers of teams meant that Kent 3 folded at the end of the 2007–08 season, with all sides automatically promoted to what was then Kent 2. However, following a 15 year hiatus, and after the RFU's Adult Competition Review in 2022 - and the decision by Kent Rugby to allow reserve teams to participate in county leagues - from season 2023–24 it was resurrected and adopted its current name Counties 5 Kent.
Joining were Lordswood, relegated from Counties 4 Kent and Sidcup III who finished 9th in Counties 4 Kent but elected to be relegated and in doing so gave Footscray (11th) a reprieve in the league above. New entries to the league were Beckenham III, Park House II, Old Alleynians III and East Peckham & Paddock Wood.
↑Restructuring of the Kent leagues meant there was no relegation.
↑8th place Kent Police would drop out of the league at the end of the season.
↑Due to Kent league restructuring, the top nine teams were promoted from Kent 3.
↑Kent league restructuring meant there was no relegation - with bottom side Canterbury Exiles the only team to remain in the division for the following season.
↑The cancellation of Kent 3 and Kent 4 and restructuring of Kent 2 for the following season meant that champions Erith would be promoted to the new regional Kent 2 East division.
↑The cancellation of Kent 3 and Kent 4 and restructuring of Kent 2 meant that runners up Faversham would also be promoted to the new Kent 2 East division while 3rd place Greenwich would go into Kent 2 South West. 4th place Darenth Valley would fold at the end of the season but would reform as Dartford Valley RFC in Kent 2 West.
↑The cancellation of Kent 4 meant that there was no relegation - bottom two sides Meopham and Canterbury Exiles would drop out of the leagues.
↑No relegation as Kent 4 abolished at the end of the season.