Hell's Mouth or Hells Mouth may refer to:Places Hell's Mouth, Cornwall, part of a group of cliff faces in Cornwall, England Boca do Inferno, (Portuguese for Hell's Mouth) a chasm near Cascais, Portugal Porth Neigwl, a beach in Llŷn Peninsula, in Gwynedd, Wales RAF Hell's Mouth, a former Royal Air Force Emergency Landing GroundOther uses Hells' Mouth, a play by Nick Darke