| Group 2 race | |
| Location | Caulfield Racecourse, Melbourne, Australia |
|---|---|
| Inaugurated | 1983 |
| Race type | Thoroughbred |
| Sponsor | Manhari Metals (2023) |
| Race information | |
| Distance | 1,400 metres |
| Surface | Turf |
| Qualification | Three year old fillies |
| Weight | Set weights with penalties |
| Purse | $300,000 (2023) |
| Bonuses | Winner is exempt from ballot for Caulfield Guineas and The Thousand Guineas |
The Thousand Guineas Prelude, registered as the Tranquil Star Stakes, is a Melbourne Racing Club Group 2 Thoroughbred horse race, for three year old fillies, at set weights with penalties, over a distance of 1400 metres, held annually at Caulfield Racecourse, Melbourne, Australia in late September. Total prize money for the race is A$300,000.[1] This event is a preparation race for the prestigious Group 1 The Thousand Guineas later in October at Caulfield.[1]