The term '' (or '''''æther''''') may refer to:
;Myth and fiction
;Science and philosophy
- The Aether Of Classical Elements is a concept, historically, used in science (as a medium) and in philosophy (as a substance).
- --- Any number of Aether Theories in alchemy, natural philosophy, and modern physics which suppose a "fifth element".
- --- Luminiferous Aether , in early physics considered to be the medium through which light propagates
;Other
- Ether , a class of chemical compounds, or specifically:
- Diethyl Ether , which has the common name "ether"
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