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 Tiz the Law, Showing Up and Nobiz Like Shobiz. Barclay trains horses year round, spending spring in New York and winter in Florida.