| Class | Group 2 | 
|---|---|
| Location | Caulfield Racecourse | 
| Inaugurated | 1982 (Listed race) | 
| Race type | Thoroughbred | 
| Sponsor | Ladbrokes (2023) | 
| Race information | |
| Distance | 1,100 metres | 
| Surface | Turf | 
| Track | Left-handed | 
| Qualification | Two year old fillies | 
| Weight | Set weights - 55½ kg | 
| Purse | $300,000 (2023) | 
The Blue Diamond Prelude Fillies is a Melbourne Racing Club Group 2 Thoroughbred horse race run under set weight conditions, for two-year-old fillies, over a distance of 1100 metres, held at Caulfield Racecourse in Melbourne, Australia in February. [1] Total prizemoney is A$300,000.
The race is a major preparatory race for the rich Blue Diamond Stakes held two weeks later.
Fillies that have captured the Blue Diamond Prelude – Blue Diamond Stakes double:
  Love a Show (1983), Courtza (1989), Lady Jakeo (1993), Alinghi (2004), Samaready (2012), Earthquake (2014), Catchy (2017) and Lyre (2019).