Watcher
Watcher may refer to

 Watcher (artificial lifeform), an insect-like robot utilized by the Diviner
 Watcher (occupation), otherwise known as a supervisor, those assigned to watch others
 Watcher (voyeur), an alternate term for a voyeur

See also
 Watcher, an alternate term for a guard
 Watcher, an alternate term for an observer
 , the fourth episode of the second season of Star Trek: Picard