| Fromdate: | 4 |
| Todate: | 8 October 2008 |
| Administrator: | Pakistan Cricket Board |
| Cricket Format: | Twenty20 |
| Tournament Format: | Round-robin and knockout |
| Host: |  Lahore |
| Count: | 3 |
| Participants: | 13 |
| Matches: | 18 |
| Previous Year: | 2006–07 |
| Previous Tournament: | 2006–07 ABN-AMRO Twenty-20 Cup |
| Next Year: | 2009 |
| Next Tournament: | 2009 RBS Twenty-20 Cup |
The 2008–09 RBS Twenty-20 Cup was the fourth season of the RBS Twenty-20 Cup in Pakistan, sponsored by Royal Bank of Scotland. It was held in Lahore from 4 to 8 October 2008. The Sialkot Stallions won their third overall and consecutive title by defeating the Karachi Dolphins in the final. As the winners, the Stallions qualified for the 2008 Champions League Twenty20, which was later cancelled.[1]
The format remained the same from the previous edition. The 13 teams are divided into four groups: Pool A with four teams, Pool B, C and D with three each. Each group plays a single round-robin tournament and the top team from each group advances to the semi-finals. The winners of the semi-finals play the final.[2]
| Points | ||
| Won | 2 points | |
| No result | 1 point | |
| Loss | 0 points |
The position of the teams in the points table is determined by:
The prize money was increased from the previous edition.[3]
The top team from each group qualify for the semi-finals.
| 3 | 3 | 0 | 0 | 6 | +1.052 | ||
| 3 | 2 | 1 | 0 | 4 | +0.454 | ||
| 3 | 1 | 2 | 0 | 2 | +0.153 | ||
| 3 | 0 | 3 | 0 | 0 | –1.607 |
| 2 | 2 | 0 | 0 | 4 | +1.047 | ||
| 2 | 1 | 1 | 0 | 2 | +0.524 | ||
| 2 | 0 | 2 | 0 | 0 | –1.550 |
| 2 | 1 | 1 | 0 | 2 | +0.216 | ||
| 2 | 1 | 1 | 0 | 2 | +0.089 | ||
| 2 | 1 | 1 | 0 | 2 | –0.245 |
| 2 | 2 | 0 | 0 | 4 | +0.575 | ||
| 2 | 1 | 1 | 0 | 2 | +1.350 | ||
| 2 | 0 | 2 | 0 | 0 | –1.925 |
Qualified for semi-finals