# Delta

Delta commonly refers to:
* Delta (letter) (Δ or δ), the fourth letter of the Greek alphabet
* D (NATO phonetic alphabet: "Delta"), the fourth letter in the Latin alphabet
* River delta, at a river mouth
* Delta Air Lines, US
Delta may also refer to:

## Places
### Canada

* Delta, British Columbia
** Delta (federal electoral district), a federal electoral district
** Delta (provincial electoral district)
* Delta, Ontario

### United States

* Mississippi Delta
* Arkansas Delta
* Delta, Alabama
* Delta Junction, Alaska
* Delta, Colorado
* Delta, Illinois
* Delta, Iowa
* Delta, Kentucky
* Delta, Louisiana
* Delta, Missouri
* Delta, North Carolina
* Delta, Ohio
* Delta, Pennsylvania
* Sacramento–San Joaquin River Delta, California
* Delta, Utah
* Delta, Wisconsin, a town and an unincorporated community
* Delta County (disambiguation)

### Elsewhere

* Delta Island, Antarctica
* Delta Stream, Antarctica
* Delta, Minas Gerais, Brazil
* Nile Delta, Egypt
* Delta, Thessaloniki, Greece
* Delta State, Nigeria
* Delta, Astrakhan Oblast, Russia
* Colonia Delta, Uruguay

## Arts and entertainment
### Fictional elements

* Delta Megazord, a Megazord in Power Rangers in Space
* Deltas, a working class in Aldous Huxley's Brave New World

### Film and television

* Delta (2008 film), Hungary
* Delta (American TV series), 1992
* Delta (Australian TV series), 1969
* Macross Delta or Macross Δ, in the Macross anime series

### Music

* Alt-J (∆), a British indie band
* Delta blues, a music style
* "Delta", a song by Crosby, Stills & Nash from Daylight Again, 1982

#### Albums

* Delta (video album), 2003, Delta Goodrem
* Delta (Delta Goodrem album), 2007
* Delta (Visions of Atlantis album), 2011
* Delta (Mumford & Sons album), 2018
* Delta, by Shapeshifter, 2013

### Other media

* Metal Gear Solid Delta, a video game
* Subject Delta, the main protagonist of Bioshock 2
* Delta (poetry magazine)
* Delta (science magazine)
* Delta (video game), 1987
* Delta FM or Delta Radio, a former UK radio station

## Businesses and organizations
### Companies

* Delta Air Lines, US
** Delta Connection, a Delta Air Lines brand
* Delta Bank, Ukraine
* Delta Cafés, a Portuguese coffee company
* Delta Electric Company
* Delta Electricity, Australia
* Delta Electronics, Taiwan
* Delta Faucet Company
* Delta Holding, a Serbian corporation
* Delta Hotels, Canada
* Delta Machinery, a tool company
* Delta Motor Corporation, South Africa
* Delta Computer, a defunct computer company
* Delta Motors Corporation, a former automobile company in the Philippines
* Delta (company), a Dutch cable operator

### Schools

* Delta State (disambiguation), several universities
* Delta College (disambiguation)
* Delta Academy (disambiguation)
* Delta Secondary School (disambiguation)
* Delta High School (disambiguation)
* Delta School District (disambiguation)
* Delta Career Education Corporation, US
* Delta International University of New Orleans, Louisiana, US
* Delta Schools, Riyadh, Saudi Arabia

### Law enforcement and military

* Delta (Norwegian police unit)
* Delta Force, U.S. Army special operations
* Space Force Delta, US Space Force logo
* Space Delta, a command echelon in the structure of the United States Space Force

### Other organizations

* Delta Sigma Theta, a historically Black college sorority often referred to simply as "Delta".
* STC Delta, a Georgian R&D center
* American Delta Party, an American political party
* San Francisco Deltas, a soccer team

## Finance

* Delta (finance), rate of change of a value
* Visa Delta or Visa Debit, a debit card

## People

* Δ, signature of David Macbeth Moir (1798–1851), Scottish physician and writer
* Delta Burke (born 1956), American actress
* Delta Goodrem (born 1984), Australian singer
* Delta Work (Gabriel A. Villarreal), American drag performer
* Penelope Delta (1874–1941), Greek author
* Delta (wrestler) (born 1985), Mexican professional wrestler

## Science and technology
### Chemistry

* Δ (delta), right-handed isomer in a coordination complex
* Delta convention, for designating allenes
* Δ, notation for double bond positions in fatty acids

### Computing

* Delta (computer), a Russian ZX Spectrum clone
* Delta encoding or delta compression, in computer communications
* Delta timing, in relation to hardware and network responsiveness
* Delta (emulator), a video game console emulator
* DELTA, an OpenVMS debugger

### Earth sciences

* Epicentral distance (Δ)
* Subtropical Storm Delta (1972), Atlantic
* Tropical Storm Delta (2005), Atlantic
* Hurricane Delta, (2020) Atlantic

### Mathematics

* Δ, a difference of state between two before and after state schemas in the Z notation
* $\delta$, the first Feigenbaum constant
* Delta connective, a unary connective in t-norm fuzzy logics
* Delta method for approximating the distribution of a function
* Difference operator (Δ)
* Dirac delta function (δ function)
* Kronecker delta ($\delta _{ij}$)
* Laplace operator (Δ)
* Modular discriminant (Δ)
* Symmetric difference (Δ)
* Non-inferiority margin (δ)
* Δ$^m$ $_n$, a class of sets in the analytical hierarchy, for every natural number m, n

### Medicine and biology

* Delta (ligand), an activator of the notch signaling pathway
* DELTA (taxonomy), a data format for descriptions of living things
* Delta (wasp), Old World genus of potter wasps
* Delta (moth) (Campydelta), a genus
* Delta variant, of SARS-CoV-2 that causes COVID-19
* Delta wave, a brain wave

### Vehicles

* Delta (rocket family)
* Delta, a tricycle layout
* Daihatsu Delta, trucks
* Delta formation, V-shaped aircraft formation
* Delta wing, a triangular aircraft wing
* Delta-class submarine (NATO reporting name), Soviet/Russian SSBN
* General Motors Delta platform, a car platform
* Lancia Delta, an Italian rally car
* Oldsmobile Delta 88, a GM 1965–1983
* TrikeBuggy Delta, an American ultralight trike

### Other science and technology

* Refractory delta, in the roof of an electric arc furnace
* Delta baryon, a subatomic particle
* Delta circuit, in three-phase electric power
* Delta robot, a delta-shaped parallel robot
* Ilford Delta, a photographic film
* Depleted Lean-channel Transistor, the first type of fin field-effect transistor

## Sport

* Delta (horse) (1946–1960), Australia
* Mississippi Valley State Delta Devils and Devilettes, sports teams, Itta Bena, Mississippi, US
* San Francisco Deltas, a soccer team
* Delta (orienteering club), a Finnish former club

## Other uses

* Delta Dental, an American system
* Delta Works, a flood-protection works in the Netherlands
* Delta, a font designed by Aldo Novarese
* Diploma in Teaching English to Speakers of Other Languages
* Delta, a quadra group used in socionics