The Cornwall League 1 2009–10 was a full season of rugby union within Cornwall League 1.
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.
| Pos | Team | Pld | W | D | L | PF | PA | PD | Pts |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Roseland (P) | 22 | 20 | 1 | 1 | 747 | 272 | +475 | 41 |
| 2 | Veor | 22 | 19 | 0 | 3 | 579 | 196 | +383 | 36[a] |
| 3 | Bodmin | 22 | 17 | 0 | 5 | 610 | 248 | +362 | 34 |
| 4 | Perranporth | 21 | 12 | 1 | 8 | 401 | 209 | +192 | 21[b] |
| 5 | Redruth Albany | 22 | 10 | 0 | 12 | 346 | 402 | −56 | 18[a] |
| 6 | Illogan Park | 21 | 9 | 0 | 12 | 231 | 358 | −127 | 18 |
| 7 | Camborne School of Mines | 21 | 12 | 2 | 7 | 575 | 364 | +211 | 16[c] |
| 8 | St Just | 21 | 8 | 0 | 13 | 204 | 464 | −260 | 16 |
| 9 | St Day | 21 | 8 | 0 | 13 | 221 | 339 | −118 | 14[a] |
| 10 | St Agnes | 22 | 6 | 1 | 15 | 351 | 420 | −69 | 13 |
| 11 | Helston | 21 | 4 | 1 | 16 | 187 | 465 | −278 | 9 |
| 12 | Lankelly-Fowey | 22 | 1 | 0 | 21 | 117 | 832 | −715 | 0[a] |
| 8 May 2010[2] |
| Honiton | 43 - 12 | Veor |
| Try: L. Johns, S. Nex, N. Guilbert, J. Barratt, J. Rice, C Sampson. Con: B. Webber (5) Drop: N. Guilbert | Try: S. Sarah, J. Williams Con: A.N. Other |
| Alhallows, Honiton |
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