Hanor Pren was a Trill scientist at the Trill Science Ministry. In 2372, he traveled with Dr. Lenara Kahn and Dr. Bejal Otner to Deep Space 9 to conduct an experiment in creating an artificial wormhole. Pren was suspicious that Lenara and Jadzia Dax might reassociate, but Bejal told him his concerns were groundless. (DS9: "Rejoined")

Hanor Pren was the only member of the Trill science team whose name stayed exactly the same in the first draft script, the final draft script, and the final version of the episode. In the first draft script, he was described as "about fifty," whereas in the final draft script, he was referred to as being "in his 50's."
Hanor Pren was played by James Noah.