Bayer (disambiguation)

Bayer is a German multinational pharmaceutical and biotechnology company.

Bayer may refer to:

• a native or inhabitant of the Free State of Bavaria (Freistaat Bayern)
• 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 04 Leverkusen, a German woman's handball 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