5 Best Horse Racing Trainers of All Time

10 racehorse trainers, from Aidan O’Brien to Willie Mullins and John Gosden, each with achievements, years active, horses trained and nationality.

Each entry names the achievements, the active years, the athletes or teams involved and the nationality. The order reflects our view of who shaped horse racing most, not a statistic, and the closing FAQ picks up what the list leaves open.

If you are working through the subject more broadly, we keep the same kind of list for horse racing books and horse racing films and documentaries.

Best Horse Racing Trainers:

Bob Baffert
Todd Pletcher
Aidan O’Brien
Sir Michael Stoute
Charlie Appleby
Willie Mullins
Chris Waller
John Gosden
Jessica Harrington
Ken McPeek

#1 Bob Baffert

🏆 Achievements: Multiple Kentucky Derby, Preakness Stakes, and Belmont Stakes wins; two Triple Crown winners
📅 Years Active: 1979 to Present
🐎 Horses Trained: American Pharoah, Justify, Arrogate, Silver Charm
🌐 Nationality: American

Bob Baffert is one of the most recognizable figures in horse racing, known for his distinctive white hair and remarkable record in American Thoroughbred racing.

He has trained two Triple Crown winners: American Pharoah in 2015 and Justify in 2018. His successes in the Kentucky Derby, Preakness Stakes, and Belmont Stakes have cemented his status as a top trainer.

Baffert’s career has not been without controversy, facing multiple medication violations and scrutiny over the health and safety of his horses. Despite this, his success at the track has earned him a place among the elite horse racing trainers.

#2 Todd Pletcher

🏆 Achievements: Multiple Eclipse Awards for Outstanding Trainer, several wins in American Classic races
📅 Years Active: 1996 to Present
🐎 Horses Trained: Always Dreaming, Super Saver, Rags to Riches
🌐 Nationality: American

Todd Pletcher stands as one of the most accomplished trainers in North American horse racing with a career featuring numerous American Classic victories.

He has an impressive roster of horses that have claimed victories in prestigious races, including the Kentucky Derby and Belmont Stakes.

Pletcher is particularly known for his ability to develop young talent and prepare horses for their most challenging races. His methodical approach to training and consistency in producing top-tier racehorses have earned him a reputation as a leading figure in the industry.

#3 Aidan O’Brien

🏆 Achievements: Multiple Irish Classic and British Classic wins; numerous Group 1 races
📅 Years Active: 1993 to Present
🐎 Horses Trained: Galileo, High Chaparral, Yeats
🌐 Nationality: Irish

Aidan O’Brien is a titan of horse racing, especially renowned for his exploits in Ireland and the UK, where he has been crowned the champion trainer multiple times.

His training base at Ballydoyle has produced a slew of champions that have won some of the most prestigious races in Europe, including the Epsom Derby and the 2,000 Guineas.

The impact of O’Brien’s training expertise is felt internationally, with successes in the Breeders’ Cup and other global events. His meticulous attention to pedigree and form has made him a dominant force in thoroughbred racing.

#4 Sir Michael Stoute

🏆 Achievements: Multiple Classic races in the UK; multiple times UK Champion Trainer
📅 Years Active: 1972 to Present
🐎 Horses Trained: Shergar, Workforce, Frankel (as a part of his career)
🌐 Nationality: British

Sir Michael Stoute is a revered name in British horse racing, having been an influential trainer with a career spanning over several decades.

He has trained the winners of all five British Classics, including a noteworthy victory with the legendary Shergar in the 1981 Epsom Derby.

Knighted for his services to racing, Sir Michael’s long-lasting success is attributed to his profound understanding of horse psychology and his adaptive training techniques. His high standards and dedication have made him a respected figure in the racing community.

#5 Charlie Appleby

🏆 Achievements: Epsom Derby victory; successes in the Breeders’ Cup
📅 Years Active: 2013 to Present
🐎 Horses Trained: Masar, Blue Point, Ghaiyyath
🌐 Nationality: British

Charlie Appleby, representing the powerful Godolphin racing operation, quickly established himself as a top-tier trainer after taking over the role in 2013.

Achieving international success, including a memorable win at the Epsom Derby with Masar, Appleby has proved his ability to prepare horses for the biggest stages.

Known for his thoughtful and analytical approach to training, he has earned accolades and commendations within the highly competitive European racing scene. His career continues to flourish with notable wins in prestigious global racing events.

#6 Willie Mullins

🏆 Achievements: Champion jumps trainer in Ireland eighteen times and the first Irish trainer to take the British jumps title, with more Cheltenham Festival winners than anyone in history.
📅 Years Active: 1988 to today
👕 Horses Trained: Hurricane Fly, Faugheen, Al Boum Photo, Galopin Des Champs
🌐 Nationality: Ireland

Mullins passed one hundred Cheltenham Festival winners, a total no other trainer has approached, and won the British trainers championship in 2024 while based in County Carlow.

His stable dominates Irish jump racing to a degree that has prompted debate about whether the sport is competitive at the top, which is itself a measure of the training operation.

#7 Chris Waller

🏆 Achievements: Australian trainer of Winx, who won thirty three consecutive races, and champion Sydney trainer more than a dozen times.
📅 Years Active: 2000 to today
👕 Horses Trained: Winx, Nature Strip, Verry Elleegant
🌐 Nationality: New Zealand

Winx won twenty five Group One races in a row and retired unbeaten in almost four years, which is the longest such run in modern racing anywhere.

Waller arrived in Sydney with a handful of horses and built the largest stable in Australia, and he trains the majority of his winners on the flat in open competition.

#8 John Gosden

🏆 Achievements: Trained Frankel stablemates and champions including Enable, Golden Horn and Cracksman, with multiple British trainers titles.
📅 Years Active: 1979 to today
👕 Horses Trained: Enable, Golden Horn, Cracksman, Stradivarius
🌐 Nationality: United Kingdom

Enable won the Prix de l’Arc de Triomphe twice and the King George three times, a record for the race, and she was trained through a long career rather than retired at three.

Gosden trained in California before returning to Newmarket, and now runs the yard in partnership with his son Thady.

#9 Jessica Harrington

🏆 Achievements: Irish trainer successful over jumps and on the flat, with a Cheltenham Gold Cup, a Champion Hurdle and Irish classics to her name.
📅 Years Active: 1987 to today
👕 Horses Trained: Moscow Flyer, Sizing John, Alpha Centauri
🌐 Nationality: Ireland

Very few trainers win a Gold Cup and a Group One flat race for fillies. Harrington has done both, and started training in her forties after an eventing career.

Sizing John took the 2017 Gold Cup and Alpha Centauri won four Group Ones in a single season the following year.

#10 Ken McPeek

🏆 Achievements: American trainer of Kentucky Derby and Belmont Stakes winners, including the 2024 Derby and Preakness with Mystik Dan and Seize the Grey.
📅 Years Active: 1985 to today
👕 Horses Trained: Mystik Dan, Sarava, Swiss Skydiver, Seize the Grey
🌐 Nationality: United States

Sarava won the 2002 Belmont at odds of 70 to 1, denying War Emblem the Triple Crown, and remains the longest priced winner in the history of the race.

McPeek trains a mid sized stable rather than the industrial operations that dominate American racing, and still wins classics out of it.