List of alleged extraterrestrial beings

This is a list of extraterrestrial beings that have been reported in close encounters, claimed or speculated to be associated with unidentified flying objects (UFOs) (not to be confused with the meaning of the term "alien species" in the biological science of ecology).

In fiction

 * Template:Fictional biology
 * Category:Lists of fictional alien species
 * List of fictional extraterrestrials
 * Lists of fictional species
 * Template:Science fiction
 * Babylon 5
 * Battlestar Galactica
 * List of alien races in DC Comics
 * List of alien races in Marvel Comics
 * Mass Effect
 * Stargate
 * Star Trek
 * Star Wars
 * The Twilight Zone