York's Juddmonte International, will be worth £1 million for the first time this year for the Ebor meeting.
Additional funds of £10,000 for the Darley Yorkshire Oaks and Coolmore Nunthorpe Stakes, with both now worth £350,000, while the Betfred Ebor is up £5,000 to £285,000.
On international rankings, the Juddmonte International is rated the best race in Britain being won by some of the biggest names in the sport with the such as Frankel, Sea The Stars, Australia and Postponed.
In boosting prize-money by £100,000, York is aiming to continue to attract the star names for the contest, which will be run on August 23 this year.
York chairman and racing manager for Khalid Abdullah's Juddmonte Farms, Teddy Grimthorpe, said: "Attracting the best horses to run in competitive races on the Knavesmire is what we are all about; so I am pleased that the unstinting support from long standing sponsors has allowed us to increase prize-money for our feature races again this year.
"The Juddmonte International will reach a notable landmark demonstrating the generous support of Prince Khalid for a race that I know he cherishes."
The Juddmonte International received a boost of £50,000 last year as part of a wider prize-money increase across the whole of the Ebor meeting.