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

Observer may also refer to:

Computer science and information theoryEdit

  • 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



  • Air observer, an aircrew member
  • Artillery observer, a front line personnel who directs fire discipline for artillery strikes
  • Royal Observer Corps, a civil defence organisation, originally tasked with reporting enemy aircraft
  • Observer, a non-participating officer, or umpire, tasked with observing the actions of soldiers during a field training or military exercise




Other usesEdit

See alsoEdit