Oki or Ōki may refer to:

Look up oki in Wiktionary, the free dictionary.

• Oki District, Shimane, a district in Shimane Prefecture, Japan
• Oki Islands, an archipelago in the Sea of Japan
• Oki Province, a former province of Japan
• Ōki, Fukuoka, a town in southern Japan
• Oki Airport, the airport serving the Oki Islands
• Oki Jubilee Stadium, a stadium in Kogarah, New South Wales, also known as Jubilee Oval
• Orkney, Chapman code OKI

• Oki (surname), two separate Japanese surnames
• Oki (musician), an Ainu musician
• Oki (rapper), a Polish rapper
• OKI (company), an electronics and printer manufacturer (Oki Data)
• Super Oki, the limited express train which runs in San'in Main Line and Yamaguchi Line of West Japan Railway
• Oki, the original name of Sheriff Callie on Sheriff Callie's Wild West back when it was going to be called "Oki's Oasis"
• Oki, a doll in the Groovy Girls doll line

• Open Knowledge Initiative, an organization that specifies software interfaces for service-oriented architecture (SOA)
• Open Knowledge International, a global UK-based non-profit network that promotes and shares information at no charge
• Ohio-Kentucky-Indiana Regional Council of Governments
• Organisasi Kerja Sama Islam (formerly, Organisasi Konferensi Islam), the Organisation of Islamic Cooperation in Indonesian

• Daisen-Oki National Park, in Chūgoku region, Japan
• Okay
• Okhi Day, a Greek anniversary to commemorate Greek Prime Minister Metaxas's rejection of the ultimatum made by Mussolini
• Okie, a resident of Oklahoma

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