HOI

HOI or Hoi may refer to:


 * Hearts of Iron, a 2002 computer game
 * Home insurance or homeowners insurance
 * Hypoiodous acid, chemical formula HOI
 * Hoi District, Aichi, a former district of Japan
 * Hoxnian geological stage, HOI is sub-stage I
 * Carsten Høi (born 1957), Danish chess Grandmaster
 * Hao Airport IATA code
 * Hoi (video game), a 1992 video game for the Amiga
 * Hearts on Ice, a 2023 Philippine television series