| Dates | 24 April – 17 September 2011 |
|---|---|
| Administrator(s) | England and Wales Cricket Board |
| Cricket format | Limited overs cricket (40 overs) |
| Tournament format(s) | Group stage and knockout |
| Champions | Surrey Lions (1st title) |
| Participants | 21 |
| Matches | 129 |
| Most runs | 649 Chris Nash (Sussex Sharks) |
| Most wickets | 21 Shane Mott (Netherlands) |
The 2011 Clydesdale Bank 40 tournament was the second season of the ECB 40 limited overs cricket competition for the English and Welsh first-class counties. In addition to the 18 counties, Scotland and the Netherlands took part, as well as the Unicorns, a team of players who did not have first-class contracts.[1]
The competition consisted of three groups of seven teams, from which the top team from each group, plus the best second-placed team, progressed to the semi-finals.[1] The groups were allocated randomly.