See also Lia.

Lias may refer to:

• In geology:
  • The Lias Group, a group in the stratigraphy of Great Britain, formed during the Late Triassic to Early Jurassic epochs and including the Blue Lias and White Lias. Its facies (the Lias facies) is found in large parts of Europe.
  • In older literature, Lias was also used as a synonym for the Early Jurassic epoch of the geologic timescale
• Lias (Troll), a troll drummer in the book Soul Music by Terry Pratchett
• Lias, Gers, a commune of the Gers département, in France
• Lias, band member, a member of South African band The Narrow
• Lias (courtesan), an ancient Greek courtesan, who charged 1,000 drachmas for a single night.

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