Oy or OY may refer to:
Oy vey Oy, a Yiddish exclamation of chagrin, dismay, exasperation or pain
A village in the Oy-Mittelberg municipality, Bavaria, Germany
oy (digraph), a digraph found in many languages
Osakeyhtiö (abbr. Oy), a prefix/postfix indicating a Finnish Limited company
Oy (Dark Tower), an animal character in Stephen King's Dark Tower series
Opportunity Youth, a Youth organization in Northern Ireland
Omni Air International (IATA airline designator)
"OY" (Oscar, Yankee), the aircraft registration code prefix for airplanes from Denmark
Oy!, a 2009 Telugu film starring Siddharth Narayan and Shamili
Oy (album), a studio album of Iranian singer-songwriter Mohsen Namjoo
Oy!, The Jewish joke book, (Oy! The Ultimate Book of Jewish Jokes)
the code for County Offaly, Ireland
Oy (archaic scots), a grandchild Dictionary of the Scots language
Oy (archaic scots), a niece or nephew Dictionary of the Scots language
OY-(three digit number), a code for flights with the former Danish airline company Conair of Scandinavia (1964–1994)

en.wikipedia.org/wiki/Oy