By
By or BY may refer to:

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

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

Other uses
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

See also
-by, a common suffix for settlements in northern England
Bye (disambiguation)