Alpha Trion is a fictional character in the various Transformers universes.

Alpha Trion is one of the Thirteen Primes, thus all his portrayals are considered to be the same individual. He is generally depicted as an ancient mechanoid with a link to Optimus Prime. Alpha Trion first appeared in the 1984 animated Transformers series as the titular character in the episode "The Search for Alpha Trion" where he was the father-figure for Optimus Prime.

Versions of Alpha Trion have since appeared in nearly all retellings of the Transformers, even going so far as being added in to the series Robots in Disguise when the was imported from Japan as a dub of the animated Car Robots. Hasbro has registered the name Alpha Trion for Trademark in the U.S. Alpha Trion's status as one of the Thirteen is a retroactive alteration to the character's history, as the Thirteen Primes are a later concept developed in the Transformers franchise, and as such the concept was not referenced in the Generation One continuities. He is, however, depicted as having existed since nearly the beginnings of Cybertron's existence. He is one of the few Transformers depicted to visibly age, both in terms of physical appearance and in the sound of his voice, something that is largely untrue of the majority of Transformers, who seem to be ageless.