Delta can stand for:
- Δ or δ, a letter of the Greek alphabet. See delta (letter)
- A kind of area positioned at the end of a river, roughly in shape of Δ. See river delta.
- An airline company, Delta Air Lines
- The letter D in the NATO phonetic alphabet
- A female in police CB code. (Alpha represents a male)
- A type of connection in three phase electrical wiring.
- Delta, Colorado
- Delta, Iowa
- Delta, Louisiana
- Delta, Missouri
- Delta, Ohio
- Delta, Pennsylvania
- Delta, Wisconsin
- Delta, Nigeria
- Big Delta, Alaska
- Delta County, Colorado
- Delta Charter Township, Michigan
- Delta County, Michigan
- Delta County, Texas
- Delta-wing
- Dirac delta function
- Delta encoding
- Delta modulation
- the Delta Works
- Delta rocket