The Mek languages are a well established family of Papuan languages spoken by the Mek people and Yali people.

They form a branch of the Trans–New Guinea languages (TNG) in the classifications of Stephen Wurm (1975) and of Malcolm Ross (2005).

Mek, then called Goliath, was identified by M. Bromley in 1967.

The Mek languages form three dialect chains (Heeschen 1998): Usher (2020) reconstructs the consonant and vowel inventories as 'perhaps' as follows:[2] Pronouns are:[2] The difference between the two 3pl forms is not known.

Some lexical reconstructions by Usher (2020) are:[2] Mek reflexes of proto-Trans-New Guinea (pTNG) etyma are:[3] Eipo language: Bime language: Kosarek language: Yale language: