Breen language
The Breen language was the language spoken by the Breen. To Human ears, it sounded like garbled electronic sounds. Universal translators needed to be adjusted in order to properly translate the syntax. () Breen could be spoken by a person wearing a Breen refrigeration suit, though it was also possible for that same person to instead speak English while wearing such a uniform. () Speakers of Breen included Thots Gor and Pran as well as a holographic Breen. (, et al.; )

In 2373, Michael Eddington sent a  that was intercepted by Benjamin Sisko aboard the . It was a heterophonic, five-line song with an alternating tetrameter and pentameter structure, but other than the catchy tune, it did not mean anything. ()

In 2375, although Cardassian leader Legate Damar was present when the Breen Confederacy allied itself with the Dominion during the Dominion War, all speech which was spoken by Thot Gor at the historic event wasn't understood by Damar, as he hadn't had a chance to adjust his universal translator yet. ()

Later that year, while Kira Nerys was disguised as a Breen and was wearing one of their uniforms, a Jem'Hadar guard who encountered her on Cardassia Prime remarked that he didn't understand something she said in Breen, though he was then immediately shot by her.

The Female Changeling once commented about the vocalizations spoken by Thot Pran, "I do find the shrillness of his voice very tiresome." ()

Episodic inclusions 

Languages