The Phrygians spoke an Indo-European language. (See Phrygian language.) Although the Phrygians adopted the alphabet originated by the Phoenicians, only a few dozen inscriptions in the Phrygian language have been found, primarily funereal, and so much of what is thought to be known of Phrygia is second-hand information from Greek sources.
Phrygian is part of the centum group of Indo-European languages. However, between the 19th and the first half of the 20th century Phrygian was mostly considered a satəm language, and thus closer to Armenian and Thracian, while today it is commonly considered to be a centum language and thus closer to Greek.