Barclay Tagg (born December 30, 1937 in Lancaster, Pennsylvania) is an American thoroughbred horse trainer. A 1961 graduate of Pennsylvania State University with a degree in Animal Husbandry. Barclay is best known for conditioning Kentucky Derby, Preakness Stakes, and Jockey Club Gold Cup winner Funny Cide. Horses in Tagg's stable have included Showing Up and Nobiz Like Shobiz. Barclay trains horses year round, spending spring in New York and winter in Florida.
Formerly a steeplechase jockey, Tagg won his first race in 1972 at Old Liberty Park. He has been a journeyman trainer for many years, and with Funny Cide became the first trainer to win the Kentucky Derby in his first attempt since Cam Gambolati with Spend a Buck in 1985. He won the 2020 Belmont Stakes with New York-bred Tiz the Law
His daughter Taryn, is also a horse trainer at Pimlico. She is also much like her father, very serious, working 25 hours a day.
- Bill Finley, "Tagg grabs the roses". ESPN.com Retrieved 2011-12-01.
- Associated Press, "Funny Side gets last laugh over Empire Maker". ESPN.com Retrieved 2011-12-01.
- Zanzucchi, Mia (20 June 2020). "Tiz the Law wins 2020 Belmont Stakes". NBC Sports. Retrieved 20 June 2020.