Alcon or ALCON may refer to:
- Alcon, a global pharmaceutical company specializing in eye care products.
- Alcon Entertainment, a production company
- ALCON, a U.S. military standard abbreviation for "all concerned"; see List of U.S. government and military acronyms
- Alcon (classical history), the name of a number of people from classical myth and history
- Conservative Alliance (Nicaragua) (ALCON), a political party in Nicaragua
- Phengaris alcon, a butterfly of the Lycaenidae family
- Phengaris alcon arenaria, a subspecies of the above
- Alcon (computer virus), a computer virus
- ALcons, an abbreviation for "Articulation Loss of Consonants", a measure of intelligibility
- Slap Fight, also known as Alcon, an arcade game
- Alcón, a surname
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