| Eastern Counties 6 | |
| Sport: | Rugby union |
| Teams: | 10 |
| Champion: | Witham (1st title) |
| Season: | 1991–92) (promoted to Eastern Counties 4 |
| Website: | ecrurugby.com |
Eastern Counties 6 was an English level 13 Rugby Union league with teams from Cambridgeshire, Essex, Norfolk and Suffolk taking part. Promoted teams used to move up to Eastern Counties 5 and, as this was the lowest tier league in the Eastern Counties divisions, there was no relegation. After just four seasons Eastern Counties 6 was cancelled at the end of the 1991–92 campaign.
When the division was created in 1988 it contained the following teams:
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| Season | No of Teams | Champions | Runners–up | Relegated Teams | |||||||||||
| 1988–89[1] | 8 | Thames Sports | No relegation | ||||||||||||
| 1989–90[2] | 10 | Old Cooperians | No relegation | ||||||||||||
| 1990–91[3] | 10 | Hadleigh | No relegation | ||||||||||||
| 1991–92[4] | 10 | Witham | No relegation | ||||||||||||
| Green backgrounds are promotion places. | |||||||||||||||