An observer is one who engages in observation or in watching an experiment.
Observer may also refer to:
Computer science and information theory
- In information theory, any system which receives information from an object
- State observer in control theory, a system that models a real system in order to provide an estimate of its internal state
- Observer pattern, a design pattern used in computer programming
Fiction
- Observer (novel), a 2023 science fiction novel by Robert Lanza and Nancy Kress
- Observer (video game), a cyberpunk horror video game
- Observer (Mystery Science Theater 3000), a fictional television character
- Observers, beings in the television show Fringe
Military
- Air observer, an aircrew member
- Artillery observer, a front line personnel who directs fire discipline for artillery strikes
- Observer, a non-participating officer, or umpire, tasked with observing the actions of soldiers during a field training or military exercise
Music
- "Observer", a song by Gary Numan on his album The Pleasure Principle
- "The Observer", a track from The Flaming Lips' 1999 album The Soft Bulletin
- The Observers, an alternative name for reggae session band Soul Syndicate
- Niney the Observer (born 1951), Jamaican record producer and singer
Publications
- Observer.com, an online-only version of the weekly newspaper The New York Observer
- Observer (APS), a member magazine of Association for Psychological Science
Science
- Observer (general relativity)
- Observer (meteorological)
- Observer (quantum physics)
- Observer (special relativity)
Other uses
- Observer status, granted by an organization to allow a non-member limited participation
- An election observer, one who assists in election monitoring
- A game official sometimes used in the sport Ultimate
- The Observer type in the Enneagram of Personality model
- Donald Alaster Macdonald (1859–1932), Australian journalist who wrote under the pseudonym 'Observer'
See also
- Observer effect (disambiguation)
- National Observer (disambiguation), a variety of publications
- The Observer (disambiguation)
- United Nations Military Observer
- All pages with titles containing Observer
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