The mentum refers to a projecting structure near the mouth of any of several animals:

  1. In insects, the mentum is the distal part of the labium. The mentum bears the palps, glossae, paraglossae, and/or ligula.
  2. On the human face, the mentum refers to the protruding part of chin.
  3. In certain mollusks, the mentum refers to a thin projection below the mouth, as in the family Pyramidellidae.