the letter "D" in a national spelling alphabet
- A census-designated place and unincorporated community in Clay County, Alabama.
- A municipality of Minas Gerais, Brazil.
- A municipality of British Columbia, Canada.
- A city and home rule municipality, the county seat of Delta County, Colorado.
- A municipality of Greece.
- An unincorporated community in Saline County, Illinois.
- A city in Keokuk County, Iowa.
- An unincorporated community in Wayne County, Kentucky.
- A village in Madison Parish, Louisiana.
- A city in Cape Girardeau County, Missouri.
- An unincorporated community in Stokes County, North Carolina.
- A village in Fulton County, Ohio.
- A village in Ontario, Canada.
- A borough of York County, Pennsylvania.
- A city in Millard County, Utah.
- A town and unincorporated community in Bayfield County, Wisconsin.
- A state in Nigeria
- delta (Greek letter)
Declension of Delta