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.
^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.
