| Administrator(s) | England and Wales Cricket Board |
|---|---|
| Cricket format | Twenty20 |
| Tournament format(s) | Group stage and knockout |
| Champions | Leicestershire Foxes (1st title) |
| Participants | 18 |
| Matches | 52 |
| Most runs | Darren Maddy (356 for Leicestershire) |
| Most wickets | Adam Hollioake (20 for Surrey) |
The 2004 Twenty20 Cup was the second edition of the T20 Blast formerly known as the Twenty20 Cup competition for English and Welsh county clubs. The finals day took place on 7 August at Edgbaston, Birmingham, and was won by the Leicestershire Foxes.