| Fromdate: | 25 |
| Todate: | 29 May 2009 |
| Administrator: | Pakistan Cricket Board |
| Cricket Format: | Twenty20 |
| Tournament Format: | Round-robin and knockout |
| Host: |  Pakistan |
| Count: | 4 |
| Participants: | 13 |
| Matches: | 18 |
| Previous Year: | 2008–09 |
| Previous Tournament: | 2008–09 RBS Twenty-20 Cup |
| Next Year: | 2009–10 |
| Next Tournament: | 2009–10 RBS Twenty-20 Cup |
The 2009 RBS Twenty-20 Cup was the fifth season of the RBS Twenty-20 Cup in Pakistan, sponsored by RBS. It was held in Lahore from 25 to 29 May 2009. The Sialkot Stallions won their fourth overall and consecutive title by defeating the Lahore Lions in the final.[1]
This tournament was held immediately before the 2009 ICC World Twenty20, which Pakistan won.
The top team from each group qualified for the semi-finals.
| 3 | 3 | 0 | 0 | 6 | +3.064 | ||
| 3 | 2 | 1 | 0 | 4 | +1.407 | ||
| 3 | 1 | 2 | 0 | 2 | −0.212 | ||
| 3 | 0 | 3 | 0 | 0 | −4.199 |
| 2 | 2 | 0 | 0 | 4 | +4.092 | ||
| 2 | 1 | 1 | 0 | 2 | −1.837 | ||
| 2 | 0 | 2 | 0 | 0 | −2.236 |
| 2 | 2 | 0 | 0 | 4 | +0.922 | ||
| 2 | 1 | 1 | 0 | 2 | −0.202 | ||
| 2 | 0 | 2 | 0 | 0 | −0.764 |
| 2 | 2 | 0 | 0 | 4 | +0.414 | ||
| 2 | 1 | 1 | 0 | 2 | +1.025 | ||
| 2 | 0 | 2 | 0 | 0 | −1.448 |
Qualified for semi-finals