Other
- Mouthpiece (band), a hardcore punk band
- Mouthpiece (comics), a DC comics character
- The Mouthpiece, a 1932 crime drama film directed by James Flood and Elliott Nugent
- Figuratively and with negative connotations to indicate the role of a spokesperson or mass media venue that is used to perpetuate the views or agenda of another, as in "the newspaper became a mouthpiece for its owner's political views."
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