IOI may refer to: * Idiopathic orbital inflammatory disease * International Olympiad in Informatics *

Interonset interval In music a time point or ''timepoint'' (point in time) is "an instant, analogous to a geometrical point in space". Because it has no duration, it literally cannot be heard, but it may be used to represent "the point of initiation of a single pitch ...

Indication of interest An indication of interest (IOI), sometimes expression of interest (EOI), is an expression in finance that demonstrates a buyer's non-binding interest in buying a security in the stock market, often before it is available for purchase. IOIs are no ...

, used in financial trading *

Interest on Investment Return on investment (ROI) or return on costs (ROC) is a ratio between net income (over a period) and investment (costs resulting from an investment of some resources at a point in time). A high ROI means the investment's gains compare favourably ...

, a synonym for Return on Investment (ROI) * IO Interactive, a Danish video game developer * International Ombudsman Institute * IOI Group, a Malaysian conglomerate *

I.O.I I.O.I (; also known as IOI or Ideal of Idol) was a South Korean girl group formed by CJ E&M through the 2016 reality show ''Produce 101'' on Mnet. The group was composed of eleven members chosen from a pool of 101 trainees from various enterta ...

, a South Korean girl group formed from the television show ''Produce 101'' * Innovative Online Industries (IOI), the fictional corporation that employs most of the antagonists of the 2011 novel '' Ready Player One'' and its 2018 film adaptation

See also