2005 Twenty20 Cup
| Dates | 22 June 2005 – 30 July 2005 |
|---|---|
| Administrator(s) | England and Wales Cricket Board |
| Cricket format | Twenty20 |
| Tournament format(s) | Group stage and knockout |
| Champions | Somerset Sabres (1st title) |
| Participants | 18 |
| Matches | 79 |
| Most runs | Owais Shah (410 for Middlesex) |
| Most wickets | Nayan Doshi (17 for Surrey) |
The 2005 Twenty20 Cup was the third edition of what would later become the T20 Blast, England's premier domestic Twenty20 competition. The finals day took place on 30 July at The Oval, and was won by the Somerset Sabres.