The Kentucky Derby ( /ˈdɜrbi/) is a Grade I stakes race for three-year-old Thoroughbreds, held annually in Louisville, Kentucky, United States, on the first Saturday in May, capping the two-week-long Kentucky Derby Festival. The race is one and a quarter miles (2 km) at Churchill Downs. Colts and geldings carry 126 pounds (57.2 kg) and fillies 121 pounds (54.9 kg). The race is known in the United States as "The Most Exciting Two Minutes In Sports History" or "The Fastest Two Minutes in Sports" for its approximate duration, and is also called "The Run for the Roses" for the blanket of roses draped over the winner. It is the first leg of the US Triple Crown and is followed by the Preakness Stakes, then the Belmont Stakes. Unlike the Preakness and Belmont Stakes, which took hiatuses in 1891-1893 and 1911-1912 respectively, the Kentucky Derby has been run every consecutive year since 1875. A horse must win all three races to win the Triple Crown. The attendance at the Kentucky Derby ranks first in North America and usually surpasses the attendance of all other stakes races including the Preakness Stakes, Belmont Stakes and the Breeders' Cup.

Kentucky (ⁱ/kɨnˈtʌki/), officially the Commonwealth of Kentucky, is a state located in the Upper South of the United States. Kentucky is one of four U.S. states constituted as a commonwealth (the others being Virginia, Pennsylvania, and Massachusetts). Originally a part of Virginia, in 1792 Kentucky became the 15th state to join the Union. Kentucky is the 37th most extensive and the 26th most populous of the 50 United States.

Kentucky is known as the "Bluegrass State", a nickname based on the fact that bluegrass is present in many of the pastures throughout the state, because of the fertile soil. It made possible the breeding of high-quality livestock, especially thoroughbred racing horses. It is a land with diverse environments and abundant resources, including the world's longest cave system, Mammoth Cave National Park; the greatest length of navigable waterways and streams in the contiguous United States; and the two largest man-made lakes east of the Mississippi River. It is also home to the highest per capita number of deer and turkey in the United States, the largest free-ranging elk herd east of Montana, and the nation's most productive coalfield. Kentucky is also known for horse racing, bourbon distilleries, bluegrass music, automobile manufacturing, tobacco and college basketball.

Derby (ⁱ/ˈdɑːbi/ DAR-bi), is a city and unitary authority in the East Midlands region of England. It lies upon the banks of the River Derwent and is located in the south of the ceremonial county of Derbyshire. In the 2001 census, the population of the city was 233,700, whilst that of the Derby Urban Area was 229,407. According to the 2001 census, Derby was at that time the 18th largest settlement in England, measured by urban area.

The city has Roman, Saxon and Viking origins.

The Roman camp of 'Derventio' was probably at Little Chester/Chester Green (grid reference SK353375); The site of the old Roman fort is at Chester Green. Later the town was one of the 'Five Boroughs' (fortified towns) of the Danelaw.

Djúra-bý, recorded in Anglo-Saxon as Deoraby "Village of the Deer". This popular belief is asserted by Tim Lambert who states, "The name Derby is derived from the Danish words deor by meaning deer settlement" without reference or proof. However some^[who?] assert that it is a corruption of the original Roman name 'Derventio'. The proven origin of the name "Derby" would seem to be elusive.