The Blue Diamond Stakes is a Melbourne Racing Club Group 1 Thoroughbred horse race for two-year-olds, at set weights, run over 1200 metres at Caulfield Racecourse in Melbourne, Victoria, Australia.^[1] The event is Victoria's richest two-year-old race with total prize money of A$2,000,000.

Prizemoney was increased from $1 million to $1.5 million in 2016 and to $2 million in 2023.

• 1971–1972 – 6 furlongs (~1200 metres)
• 1973 onwards – 1200 metres

In 1996 the event was held at Flemington Racecourse due to reconstruction of Caulfield Racecourse. In 2023 the race was run at Sandown Racecourse.

• Trainer: David Hayes – 5 wins^[1]
• Jockey: Dwayne Dunn – 4 wins^[1]
• Time: Hurricane Sky (1994): 1:08.1

• 2025 – Devil Night^[2]
• 2024 – Hayasugi^[3]
• 2023 – Little Brose^[4]
• 2022 – Daumier^[5]
• 2021 – Artorius^[6]
• 2020 – Tagaloa^[7]
• 2019 – Lyre^[8]
• 2018 – Written By^[9]
• 2017 – Catchy^[10]
• 2016 – Extreme Choice^[11]
• 2015 – Pride Of Dubai^[12]
• 2014 – Earthquake^[13]
• 2013 – Miracles Of Life^[14][15]
• 2012 – Samaready^[16]
• 2011 – Sepoy^[17]
• 2010 – Star Witness^[18]
• 2009 – Reward For Effort^[19]
• 2008 – Reaan^[20]
• 2007 – Sleek Chassis^[21]
• 2006 – Nadeem^[22]
• 2005 – Undoubtedly^[23]
• 2004 – Alinghi^[24]
• 2003 – †Kusi^[25]
• 2002 – Bel Esprit^[26]
• 2001 – True Jewels^[27]
• 2000 – Road To Success^[28]
• 1999 – Redoute's Choice^[29]
• 1998 – Danelagh^[30]
• 1997 – Knowledge^[31]
• 1996 – Paint^[32]
• 1995 – Principality^[33]
• 1994 – Hurricane Sky^[34]
• 1993 – Lady Jakeo^[35]
• 1992 – Riva Diva^[36]
• 1991 – Canonise^[37]
• 1990 – Mahaasin^[38]
• 1989 – Courtza^[39]
• 1988 – Zeditave^[40]
• 1987 – Midnight Fever^[41]
• 1986 – Bounding Away^[42]
• 1985 – Let's Get Physical^[43]
• 1984 – Street Cafe^[44]
• 1983 – Love A Show^[45]
• 1982 – Rancher
• 1981 – Black Shoes
• 1980 – Aare
• 1979 – Star Shower
• 1978 – Manikato
• 1977 – Blazing Saddles
• 1976 – Out Of Danger
• 1975 – Lord Dudley
• 1974 – Forina
• 1973 – New Gleam
• 1972 – John's Hope^[46]
• 1971 – Tolerance^[47][48]