Queen Elizabeth II, the longest serving monarch in the UK, died at the age of 96.
After her death was announced, there were messages from people.
There was a minute's silence at the games.
She was described as the sport's greatest supporter.
One of the sport's great advocates was honoured by the racecourse.
The Queen has enjoyed many high-profile victories at the track, including when Estimate won the Gold Cup in 2013).
The nation mourns the loss of a much loved and respected monarch. A great supporter of the world of racing has died.
Some wonderful victories in the royal colors were among the many memories of the Queen at this.
The country has lost its Queen but she was more than that. Someone who was the greatest servant has passed away. She was the absolute best.
It was a pleasure to talk and discuss horses with her, as she knew them inside out. Her loss is hard to comprehend. I am very emotional today.
It was an honor and a pleasure to train Estimate for the Queen because she had such a good knowledge of the horse.
"We will miss your knowledge, passion, sense of humour, charming ease, and most of all your irreplaceable presence," said AP McCoy. Ma'am, please rest in peace.
The Premier League said it was deeply sad by the death of the Queen.
Everyone around the world is mourning the death of Her Majesty the Queen.
"On behalf of the league and its clubs, we join the rest of the nation and people across the world in mourning the passing of our Queen, Elizabeth II."
England men's and women's captains Harry Kane and Leah Williamson described the Queen as an "amazing inspiration" and "a light so bright, she gave us hope when there seemed to be none".
"The Queen was one of the most respected heads of state ever to have lived, and I send my sympathies to the Royal Family and all of the citizens of the United Kingdom and the Commonwealth," said Mohammed Ben Sulayem.
The Royal Family has supported the sport of motor sport in the United Kingdom for a long time.
The events taking place around the world this weekend will undoubtedly be done in honor of Her Majesty.
The England and Wales Cricket Board expressed sadness at the death of Queen Elizabeth II.
Richard Thompson said that he spoke for everyone in the game when he said how sad he was. She was a great supporter of the game and was always talking about the sport with her late husband.
She will always be remembered for her country's dedication. We owe her a debt that can never be paid back.
Thomas Bjorn, who captained the victorious European Ryder Cup team, said he was sad about the death of Queen Elizabeth II. An inspiration to a lot of people. Rest in peace.
The US Open champion, Matt Fitzpatrick, mourned the death of his friend, the queen of England.
Simon Johnson said the governing body was grateful to the Queen.
"On behalf of the RFL and the whole Rugby League family, I extend our deepest and most sincere sympathies to the family of Her Majesty Queen Elizabeth II who passed away today." He said that the sport was in deep mourning at the news.
Her Majesty's spirit and wisdom has been an example to all of us since she became the patron of Rugby League.
Thanks are given to Her Majesty's constant and positive influence on our communities.
We send our deepest sympathies to the Royal Family and the RFL patron. Wherever rugby league is played in the next few days, our clubs and players will show their respect to Her Majesty.
The chairman of European Professional Club Rugby paid tribute to the organization.
All of us at EPCR were sad to learn of the passing of Queen Elizabeth II. We stand together to honor Her Majesty and her life.
Queen Elizabeth II embodied steadfastness, dignity and faithful public service and was loved by people around the world.
"On behalf of the rugby union community in England, all at the Rugby Football Union are very sad to hear of the death of Her Royal Highness Queen Elizabeth II."
Scottish Rugby said it was sad to hear of the death of the Queen and offered its sympathies to the Royal Family.
For over 50 years, our RoyalPatron graced our national stadium. We wish The Queen well on this sad day.
Irish Rugby expressed their sympathies to the Royal Family on Queen Elizabeth II's death. We sympathize with the Home Unions and their supporters.
Scott Lloyd paid tribute to the Queen in a statement.
She devoted her life to public service. She supported a lot of charities and organizations.
She gave up her time in order to open the National Tennis Centre in 2007. Her loss will be felt by everyone in the Commonwealth.
The rest of the country is sending their sincere sympathies to the royal family.
The Queen was loved all over the world and meant so much to so many.
It was a great honor to meet her. She was warm and dedicated to the British people during her reign.
Linford Christie said "Thank you for always showing me kindness", while Adam Gemili said he didn't think he would feel sad. Rest in peace queen Elizabeth II Thanks for all you did.
British Cycling and a number of prominent teams and riders paid their respects, with six-time Olympic champion Chris Hoy writing: "I share the sadness and sorrow of all Britons and many others around the world."
Hoy, who was knighted in 2009, said, "I had the pleasure of meeting Her Majesty on a number of occasions and always admired her dedication and commitment to her role, as well as the generosity and compassion she offered to all those she met."
The Queen guided us through many historic moments with great leadership.
Tyson and Anthony issued statements on their social media accounts.
Joshua wrote "rest in peace" while Fury posted a picture with the words "thoughts and prayers with my Queen tonight".