Loyd "Boo" Gentry Jr. (January 19, 1925 – July 1, 2012) was an American horse trainer best known for training Proud Clarion to win the 1967 Kentucky Derby.
Loyd Jr. was also the nephew of Olin B. Gentry, who managed the horse breeding operations of Colonel Edward R. Bradley.
In 1964, he sent out the two-year-old Umbrella Fella to win four races including the Breeders' Futurity Stakes In 1965, Gentry became trainer to John W. Galbreath's Darby Dan Farm.
The move forced him to give up training a promising two-year-old named Kauai King[3] who went on to win the following year's Derby.
[4] Gentry Jr. trained the 1967 Kentucky Derby winner, Darby Dan Farm's, Proud Clarion, ridden by Bobby Ussery.