Aethra or AETHRA may refer to:

• Aethra, Greek mythology
• Aethra, a genus of crab in the family Aethridae
• AETHRA, a Brazilian auto testing company
• Aethra, a fictional moon in the Colony Wars franchise. It is the eighth and outermost satellite of the gas giant Galatea
• 132 Aethra, an M-type main-belt asteroid

br:Etra (dishe velout) de:Aithra (Begriffskl rung) el: fr: thra nl:Aethra pl:Ajtra