by

• By, Doubs, France, a commune
• By, Norway, a village

• Belarus ISO country code
• .by, country-code top-level domain for Belarus
• Burundi, obsolete FIPS Pub 10-4 and NATO digram country codes
• TUI Airways IATA airline code, formerly Thomson Airways, Thomsonfly and Britannia Airways

• John By (1779–1836), British military engineer famous for his work in Canada
• CC BY, a Creative Commons attribution license
• Budget year, a synonym for fiscal year
• B-Y, blue-luminance difference in color

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• -by, a common suffix for settlements in northern England
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• Beye
• Bye (disambiguation)
• Buy (disambiguation)
• Bie (disambiguation)
• BI (disambiguation)

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