An observer is one who engages in observation or in watching an experiment.

Observer may also refer to:

Computer science and information theory

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  • 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

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Military

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  • 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

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Publications

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  • 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

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Other uses

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See also

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