Derby is a cathedral city and unitary authority area located on the River Derwent in Derbyshire, England. As a unitary authority, the city maintains administrative independence from the Derbyshire County Council. The county of Derbyshire itself takes its name from Derby, which served as its original county town.
As of 2024, the population of Derby is 274,149. The city serves as a significant urban center within the United Kingdom's East Midlands region.