Hoi
HOI or Hoi may refer to:
- Home insurance, or homeowners insurance (HOI)
 - Hypoiodous acid, chemical formula HOI
 - Hoi District, Aichi, Japan
 - Carsten Høi (born 1957), Danish chess Grandmaster
 - Hao Airport, French Polynesia, IATA code HOI
 - Hoi (video game), 1992
 
See also
- H0i, or H0f, a rail transport modelling scale
 - HO-1 (disambiguation), including HO1
 - H1 (disambiguation), including H01
 - Hoe (food), various Korean raw fish dishes
 - Hoi polloi
 - Holl, a surname
 - Oi (interjection)