Betfair has sponsored The Betfair Chase at Haydock Park since it started in 2005 and The Betfair Tingle Creek at Sandown Park since 2015.
The extension to those partnerships, announced on Wednesday, will see Betfair continue as the sponsor of both races for a further three years, to include the 2019 renewals.
Betfair was a founding Authorised Betting Partner of British Racing and became the first betting operator to sign a commercial partnership with Jockey Club Racecourses after it was announced the Jockey Club would only enter into agreements with ABPs - those who make a fair contribution to the sport. The ABP scheme has now concluded following the reform of the levy.
The 2017 Betfair Chase Day will be staged on Saturday November 25. The three mile Grade 1 race is the first leg of the Jockey Club's Chase Triple Crown and has been won three out of the last four years by the Colin Tizzard-trained Cue Card. Previous winners of the race include two of Betfair ambassador Paul Nicholls' star chasers, Kauto Star and Silviniaco Conti.
The Betfair Tingle Creek Chase is an established flagship event in the 2m chase division since being upgraded to a Grade 1 contest in 1994. Previous winners of the race include Moscow Flyer, Kauto Star, Sprinter Sacre, Sire De Grugy and last year's victor Un De Sceaux. This year the race takes place on Saturday December 9.
Barry Orr, Spokesman for Betfair said: "We are once again delighted to back two of the most exciting and iconic races in the National Hunt calendar.
"This will be the 13th renewal of the Betfair Chase and we are extremely proud to have helped establish the race as a premier target for top chasers and young pretenders alike. It is a race with a rich history which continues to be a strong and sound platform to chasing success.
"The Betfair Tingle Creek is an exhilarating race synonymous with speed, accuracy and brilliance. And with the magnificent Altior pencilled in for the race there is a lot to look forward to this National Hunt season."
Paul Fisher, Chief Executive of Jockey Club Racecourses, said: "As a major supporter of British Racing we're delighted Betfair is continuing to partner with us on two of the biggest days of Jump racing in the calendar.
"ABP may have finished following the reform of the levy, but we remain extremely grateful to Betfair, not only for the role they played as a founding partner, but also for the ongoing support they offer to racing.
"The Betfair Chase and The Tingle Creek Chase have been won by some of the greatest Jumps horses in history and we are proud to stage these races at Haydock Park and Sandown Park."