Bayer may refer to:
- a native or inhabitant of the Free State of Bavaria (Freistaat Bayern)
 - Bayer AG, a German chemical and pharmaceutical company
 - Bayer (crater), a lunar crater
 - Bayer filter, a color filter mosaic also known as a Bayer pattern or Bayer mask, used in digital camera image sensors
 - Bayer designation for star names
 - KFC Uerdingen 05, formerly known as FC Bayer 05 Uerdingen, a German football club
 - Bayer Leverkusen, a German sports and football club
 - Bayer Esporte Clube, a Brazilian football club
 - Baeyer's reagent, a mild oxidation reagent used in organic chemistry
 - Bayer (surname), list of people with this name
 
See also
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