OXI, or Ohi Day, is a holiday in Greece on 28 October.
OXI or Oxi may also refer to:
Cocaine paste, a crude extract of the coca leaf Karakoçan, a town of Elazığ Province in the Eastern Anatolia region of Turkey Starke County Airport, the FAA LID code OXI Roxicodone, a trade name for opioid oxycodone
See also Oxy (disambiguation)