| 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 played | 52 |
| Most runs |
Darren Maddy (356 for Leicestershire) |
| Most wickets |
Adam Hollioake (20 for Surrey) |
The 2004 Twenty20 Cup was the second competing of 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.