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A domain is a geographic area controlled by a single person or organization. Domain may also refer to:

Law and human geography

Demesne, in English common law and other Medieval European contexts, lands directly managed by their holder rather than being delegated to subordinate managers
Domaine, a large parcel of land under single ownership, which would historically generate income for its owner.
Eminent domain, the right of a government to appropriate another person's property for public use
Private domain / Public domain, places defined under Jewish law where it is either permitted or forbidden to move objects on the Sabbath day
Public domain, creative work to which no exclusive intellectual property rights apply
Territory (subdivision), a non-sovereign geographic area which has come under the authority of another government

Science

Domain (biology), a taxonomic subdivision larger than a kingdom
Domain of discourse, the collection of entities of interest in logical analysis
High-field domain (physics) in semiconductors, also called Böer domain
Knowledge domain, knowledge within a certain discipline, often formalized as a terminology
Magnetic domain (physics), a region within a magnetic material which has uniform magnetization
Protein domain (biology), a part of a protein that can exist independently of the rest of the protein chain
Social domain, a concept in sociology

Mathematics

Domain (mathematical analysis), an open connected set
Domain (ring theory), a non-trivial ring without left or right nonzero zero divisors
- Integral domain, a non-trivial commutative ring without nonzero zero divisors
  - Atomic domain, an integral domain in which every nonzero non-unit is a finite product of irreducible elements
  - Bézout domain, an integral domain in which the sum of two principal ideals is again a principal ideal
  - Euclidean domain, an integral domain which allows a suitable generalization of the Euclidean algorithm
  - Dedekind domain, an integral domain in which every nonzero proper ideal factors into a product of prime ideals
  - GCD domain, an integral domain in which every two non-zero elements have a greatest common divisor
  - Principal ideal domain, an integral domain in which every ideal is principal
  - Unique factorization domain, an integral domain in which every non-zero element can be written as a product of irreducible elements in essentially a unique way
Domain of a function, the set of input values for which the (total) function is defined
- Domain of definition of a partial function
- Natural domain of a partial function
- Domain of holomorphy of a function
Domain of an algebraic structure, the set on which the algebraic structure is defined
Domain of discourse, the set of entities over which logic variables may range
Domain theory, the study of certain subsets of continuous lattices that provided the first denotational semantics of the lambda calculus
Frequency domain, the analysis of mathematical functions with respect to frequency, rather than time
Fundamental domain, subset of a space that contains exactly one point from each orbit of the action of a symmetry group
Time domain, the analysis of mathematical functions with respect to time

Information technology

Administrative domain
Broadcast domain, in computer networking, a group of special-purpose addresses to receive network announcements
Collision domain
Domain (software engineering), a field of study that defines a set of common requirements, terminology, and functionality for any software program constructed to solve a problem in a given field
- Application domain, a mechanism used within a Common Language Infrastructure to isolate executed software applications from one another
- Programming domain, a set of programming languages or programming environments that were engineered specifically for a particular domain (software engineering)
Network domain, a named grouping of hosts and servers with managed login, access to resources, and permissions.
- Domain name, a label that identifies a realm of administrative autonomy, authority, or control within the Internet
Attribute domain, the set of values allowed in an attribute.

Places

The Domain (Austin, Texas), a shopping mall in Austin, Texas, United States
Domain (Hong Kong shopping centre), a shopping mall in Yau Tong, Kowloon, Hong Kong
Domain, Manitoba, a hamlet in Manitoba, Canada
Domain Precinct, a part of South Yarra in Melbourne, Victoria, Australia

Australian public domains

Name for parkland made available for public use by the monarch or representative; examples below

The Domain, Sydney, a large open space near the central business district of Sydney
Kings Domain, Melbourne, Victoria
Queens Domain, Hobart, Tasmania

New Zealand public domains

Per Public Domains Act 1860 (24 Victoriae 1860 No 32); examples below

Auckland Domain: a large inner-city park in Auckland
One Tree Hill Domain in Auckland
Mount Eden Domain in Auckland
Mount Smart Domain in Auckland
Mangere Domain in Mangere
Hamilton Lake Domain in Hamilton
Taumarunui Domain in Taumarunui
Ashburton Domain in Canterbury
Ocean Beach Domain in Dunedin

Entertainment

Film

Domain (2009 film), a French film
Domain (2016 film), an American film
The Domain (film), a 2019 Portuguese film

Music

"Domain", track by John Carpenter from Lost Themes
"Domain", a song by KSI from the 2020 album Dissimulation

Other uses

Domain, or battlespace, a concept in military operations dividing operating environments into defined components
Domain Group, an Australian real estate marketing portal, owner of the brand domain.com.au and others