A demonstrator may be:
- A person performing a demonstration, such as to explain science or technology
 - A person demonstrating a product for sale live or in an infomercial
 - An attendee at a political rally
 - An academic rank
 - A vehicle adapted to emergency service specification, and issued to locations for use as a prospective emergency vehicle if adopted to that workforce either police, ambulance or fire.
 - A fountain pen with a transparent body originally used so dealers could show customers how they worked. See Demonstrator pen
 - Demonstrator (film)
 
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