Aug or AUG may refer to:
- An abbreviation of August, the eighth month of the year in the Gregorian calendar
- Augusta State Airport in Augusta, Maine (IATA Code: AUG)
- Steyr AUG, an Austrian series of firearms
- Start codon, the three-nucleotide sequence that starts translation of mRNA, and codes for the amino acid Methionine
- Aztlan Underground, an activist rock en Español and hip hop group
- Applicative Universal Grammar, a linguistic theory
- an augmented chord
- AUG is an abbreviation for the digital gold currency unit "grams of gold, payable in e-gold" (AU being the chemical symbol for gold, G representing grams)
- Augusta Railroad, defunct Arkansas railroad
- The codon for the amino acid Methionine
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