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)