noun

• Any of several annual horse races.
• (by extension) Any organized race.
• (US) A bowler hat.
• (sports) A sports match between rival teams.
• (sports) A local derby.
• A city and unitary authority in Derbyshire, in the East Midlands, England; formerly the county town.
• A suburb of Barnstaple, North Devon district, Devon, England (OS grid ref SS5633).
• A small town in Tasmania, Australia.
• A town in Kimberley, Western Australia.
• A locality in Langley district municipality, in southwestern British Columbia, Canada.
• A parish and community therein, in Northumberland County, New Brunswick, Canada.
• A small town in North West province, South Africa.
• Various places in the United States:
• A census-designated place in Adams County, Colorado; much of Derby was annexed by Commerce City in 1962.
• A city in New Haven County, Connecticut.
• An unincorporated community in Ford County, Illinois.
• An unincorporated community in Mountain Township, Saline County, Illinois.
• An unincorporated community in Union Township, Perry County, Indiana.
• A tiny city in Lucas County, Iowa.
• A city in Sedgwick County, Kansas.
• An unincorporated community in St. Francois County, Missouri.
• An unincorporated community in Frio County, Texas.
• A town in Orleans County, Vermont.
• An unincorporated community and coal town in Wise County, Virginia.
• A type of cheese made in Derby, England.