Los Tralfamadorians, raza alienígena de ficción, son mencionados en varias novelas de Kurt Vonnegut. Tralfamadore es el nombre de su planeta. Los detalles sobre sus habitantes varían de novela en novela.

In Slaughterhouse-Five, Tralfamadore is the home to beings who exist in all times simultaneously, and are thus privy to knowledge of future events, including the destruction of the universe at the hands of a Tralfamadorian test pilot.
In The Sirens of Titan, Tralfamadore is a planet in the Small Magellanic Cloud and the home of a civilization of machines, which dispatches Salo to a distant galaxy with a message for its inhabitants.
In God Bless You, Mr. Rosewater, Tralfamadore is a hypothetical foreign planet, used in a purely rhetorical sense as part of a thought exercise.
In Hocus Pocus, Tralfamadore is the planet nearest to a meeting place of ancient multi-dimensional beings who supposedly control all aspects of human life, including social affairs and politics.
In Timequake, Tralfamadore is mentioned offhand as a fantastical meeting place of anthropomorphized chemical elements.


In the novel Slaughterhouse-Five, protagonist Billy Pilgrim reports that the Tralfamadorians look like upright toilet plungers with a hand on top, into which is set a single green eye:
...they were two feet high, and green, and shaped like plumber's friends. Their suction cups were on the ground, and their shafts, which were extremely flexible, usually pointed to the sky. At the top of each shaft was a little hand with a green eye in its palm. The creatures were friendly, and they could see in four dimensions. They pitied Earthlings for being able to see only three. They had many wonderful things to teach Earthlings about time.
Tralfamadorians have the ability to experience reality in four dimensions; meaning, roughly, that they have total access to past, present, and future; they are able to perceive any point in time at will. Able to see along the timeline of the universe, they know the exact time and place of its accidental annihilation as the result of a Tralfamadorian experiment, but are powerless to prevent it. Because they believe that when a being dies, it continues to live in other times and places, their response to death is, "So it goes." They are placid in their fatalism, and patiently explain their philosophy to Pilgrim during the interval he spends caged in a Tralfamadorian zoo. Eventually Pilgrim adopts their attitude, is returned to Earth, and tries to spread their philosophy.


privy: made a participant in knowledge of something private.
plungers: tool that is used to release stoppages in plumbing.
shafts: a long rod.