Demon (disambiguation)
Demon could refer to:

 Demon, various mythological demons that have been referenced
 Blue demon, a Tellarite pejorative for Andorians
 , a Star Trek: Voyager episode

It might also refer to:
 "Demon class", the nickname for an inhospitable class of planet
 "Demons of Air and Darkness", name sometimes used to describe the ancient civilization from Iconia
 "The Demon with the Golden Voice", an ancient Talaxian folktale
 Demonica

Episodes
 
 

Novels
 Pocket TOS: Demons (novel)
 Pocket DS9: Demons of Air and Darkness
 

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