Lias
Lias may refer to:

Geology
 Lias Group, a lithostratigraphic unit in western Europe
 Lias Formation, a geologic formation in France
 Lias (period), the 19th-century name for the Early Jurassic epoch, named after certain rocks of the era

People
 Godfrey Lias, British author
 Mohd Shamsudin Lias (born 1953), Malaysian politician
 Lias Andersson (born 1998), Swedish hockey player

Other uses
 Lias (journal), title of the Journal of Early Modern Intellectual Culture and its Sources
 Lias, Gers, a commune of the Gers département in France
 LIAS (gene), a gene that in humans encodes the protein lipoic acid synthetase

See also
 Lyas, a commune in southern France
 Lia (disambiguation)