Cassia may refer to:
Given name
Cassia, Kezia or Keziah, a female surname of Biblical origin, thought to be derived from the Greek 'Cassia'
the female gentilicium name of the Cassii (gens Cassia) of Ancient Rome
Cassia or Kassia, Byzantine abbess and music scholar (9th century)
Cássia Eller (1962–2001), Brazilian musician
Cassià Maria Just (1926–2008), Catalan abbot
Sant Cassia or Sant-Cassia, a noble family of Ġnejna Bay, Malta
* Cassia – Greek – Cinnamon
Surname
Francis Sant-Cassia (1920–1988), 7th Count Sant, murdered
