Observer may refer to:
- Any person who is observing
- The Observer personality type
- Air observer, an aircrew member of a (usually military) aircraft
- Observer (special relativity), a notion from the special relativity theory
- In information theory, any system which receives information from an object.
- A 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
- Observer (MST3K) aka Brain Guy, one of many omnipotent aliens in Mystery Science Theater 3000
- "The Observer", a track from The Flaming Lips' 1999 album The Soft Bulletin
- The observer effect, changes that the act of observing will make on the phenomenon being observed
- "Observer Effect", the 87th episode from the television series Star Trek: Enterprise
- Observer status, granted by an organization to a non-member, allowing the non-member limited ability to participate in the organization's activities
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