Bithia or Bitia[1] was a Phoenician, Carthaginian, and Roman town located near Chia in the extreme south of Sardinia, Italy.

Bithia was founded by the Phoenicians in the 8th century BC as Bitan (Punic: 𐤁𐤉‬𐤕‬𐤏‬𐤍, BYTʿN,[1][2] "Palace").

[3] It was abandoned in the early 7th century, when the population fled inland to escape Arab raids.

Still observable are the remains of a Punic temple on the island of Cardolinu, on which are also found artifacts that seem to indicate the presence of a tophet.

Additional remains of houses and a second temple dedicated to Bes are located at the foot of the promontory on which stands the Spanish tower called "Chia", the current name of the modern village.