| 75th Claxton Shield Diamond Anniversary | |
|---|---|
 | |
| Sport | Baseball |
| Defending champions | Perth Heat (2008) |
| Duration | 2 December 2008 – 8 February 2009 |
| Number of teams | 5 |
| Regular season | |
| First place | Perth Heat (12–4) |
| Second place | Victoria Aces (10–6) |
| Third place | New South Wales Patriots (9–7) |
| Fourth place | Queensland Rams (8–8) |
| Fifth place | South Australia (1–15) |
| Finals series | |
| Champions | Perth Heat (10th title) |
| Runners-up | New South Wales Patriots |
The 2009 Diamond Anniversary Claxton Shield was the 75-year anniversary of the Claxton Shield and was held from 2 December 2008 to 8 February 2009 and was the Shield's Diamond anniversary. The Perth Heat won the tournament after defeating the New South Wales Patriots 3–2 in the third game of a best of three series.