Organization or organisation (for more information about the spelling differences, see American and British English spelling differences#-ise, -ize (-isation, -ization)) is a formal group of people with one or more shared goals. It can be a non-profit organization.

Organization or organisation may also refer to:
Organizing, the act of rearranging elements following one or more rules
Organisation (band)
The Organization (band)
Organisation (album), an album by Orchestral Manoeuvres in the Dark
Self-organization, a cross-discipline concept of a complex system defining its own internal structure.
The Organization (film), a 1971 American crime film directed by Don Medford—the last in the Virgil Tibbs trilogy starring Sidney Poitier.
The Organization, an evil society in the animated series Ben 10
Universal Zulu Nation, an international hiphop group known as "The Organization"
Organization XIII, the villains in Kingdom Hearts: Chain of Memories and Kingdom Hearts II
The O (political group), short for The Organization, was an American Maoist group led by Theo Smith, which is said by anti-cult groups and former members to have been a cult
The formation of granulation tissue, in pathology
Angkar, "the Organization", the secretive governing body of Cambodia under Pol Pot.