The Thebaid, or Thebais, was a region of ancient Egypt.

Thebaid or Thebais may also refer to:

Thebais (Greece) or Thebaid, a region of ancient Boeotia, containing the city of Thebes Thebaid (Greek poem) or Thebais, an Ancient Greek epic poem telling the story of the war between Eteocles and Polynices Thebaid (Latin poem) or Thebais, an epic poem by the Roman poet Statius on the same subject Thebaid or Thebais, an epic poem by Antimachus The Thebaid (painting), a c. 1460 painting by Paolo Uccello La Thébaïde, a 1664 play by Jean Racine