A yak is a long-haired species of cattle

Yak may also refer to:

• Yakovlev Design Bureau (now the Yak Aircraft Corporation), or aircraft designed or manufactured by this company
• "The Yak", Nigerian footballer Yakubu Aiyegbeni
• "Yak", British game designer Jeff Minter
• yacc, a computer program that generates parsers
• Yak-B 12.7mm machine gun, a Russian .50 caliber four-barrel gatling gun
• The Yaks, a German cover band from the 1960s

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