Lusia or Lousia () was a deme of ancient Attica, of the phyle Oeneïs, sending one delegate to the Athenian Boule. Stephanus of Byzantium notes it was named after a heroine named Lusia, a daughter of Hyacinthus the Lacedaemonian.
The deme is attested in inscriptions; one a funerary inscription of a townsperson,IG II2 6756. another describing the deme's contributions to construction of the Eleusinion.IG II2 1672 line 195.
The site of Lousia is in the Kephisos valley, west of modern Athens.
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