See also Beyer and buyer.

Bayer may refer to:

• 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, formally known as FC Bayer 05 Uerdingen, a German football club
• Bayer Leverkusen, a German sports and football club
• Johann Bayer, a German astronomer, who introduced star designation named after him
• Baeyer's reagent, a mild oxidation reagent used in organic chemistry
• Herbert Bayer, an Austrian graphic designer, painter, and photographer
• Josef Bayer (1852-1913), Austrian composer

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.