2009–10 Cornwall League 1

The Cornwall League 1 2009–10 was a full season of rugby union within Cornwall League 1.

Team Changes
Roseland, as Champions, were promoted to the Tribute Cornwall/Devon League for season 2010-11. In the play-off for promotion to the Cornwall/Devon league, Veor lost to Honiton (12 - 43) and remained in the Tribute Cornwall League for the following season.