Oi

Oi (also as OI) may refer to:

In biology

 * Grey-faced petrel, also known by its Māori name oi
 * Orthostatic intolerance, a disorder of the autonomic nervous system
 * Osteogenesis imperfecta, a group of genetic bone disorders

In business

 * Oi (telecommunications), the largest landline telephone company in Brazil
 * Operational intelligence, in business analytics
 * Organizational intelligence, in business manage

In linguistics

 * Oi (digraph), a Latin-script digraph
 * Oi (interjection), an interjection used to get someone's attention, or to express surprise or disapproval
 * Oi language, a Mon–Khmer dialect cluster of southern Laos
 * Gha, a letter (Ƣ ƣ) erroneously referred to by Unicode as "oi"

In music

 * Oi!, a subgenre of punk rock
 * "Oi!" (song), a 2002 hit song for British grime music crew More Fire Crew

Organisations

 * Oi! (Hong Kong), a visual arts organisation in Hong Kong
 * Oi (Indonesia), an Iwan Fals fanbase foundation in Indonesia
 * Oriental Institute (disambiguation)
 * Orphans International, a global charitable organization that benefits orphans and abandoned children

Other uses

 * Japanese cruiser Ōi
 * O-I, a Japanese tank design of the Second World War
 * Organoid intelligence, a field of study related to computer science and biology
 * Object Invasion, an American animated webseries from 2016-2020
 * Object Insanity, an Irish animated webseries from 2014-2018