Leinth is an Etruscan Death-Goddess, whose name means "Old Age" or "Old Woman". She is depicted at the gates to the Underworld, or as a representative of Death or the journey to (or from) the Underworld. On one mirror-back She is shown with Mean, one of the Lasas or Fate-Goddesses, and Hercle (Herakles) who is retrieving the triple-headed dog Kerberos from the Underworld as His twelfth and last Labor. Mean is crowning Him with a wreath, to indicate the successful completion of His Labors, and Leinth's presence is symbolic of the scene's setting at the threshold between the Underworld and the world of the living. Leinth is also depicted alongside Maris or Mars, who appears in triplicate form on another mirror-back: as Maris Husrnana ("the Youth") He is shown as a boy, the son of Menrfa and Hercle; as Maris Halna He is an adult, a bridegroom; and as Maris Isminthianus ("He Who Brings Misery") He is shown with Leinth as either dead, in the Underworld, or as a Death-God Himself.

Leinth's name is related to many gloomy words in Etruscan, such as leine, "to die"; leinie, "dead" or "inert"; another more literal meaning of Her name is "She Who Stops".

Despite Her name She is depicted as a young Goddess.