Bureau of Investigation, the original name of the Federal Bureau of Investigation.

An altered spelling of boy used for various purposes, including:

Bank of Ireland. One of Ireland's largest commercial banks.

Bank of India. One of India's largest commercial banks.

As a spelling that is deliberately altered for reasons of gender identification, sexuality, or group affinity; see Boi (gender)

Frederik Boi, a Belgian professional football player

In goth (and sometimes punk) subculture boi is used to refer to a young man not afraid to experiment with traditionally "feminine" things such as eyeliner, frills, etc. and as a protest against gender roles

As an alternative spelling, such as the rapper Big Boi and the song titled "Sk8er Boi" by Avril Lavigne

Paolo Boi, (1528-1598) Italian chess player who beat the Pope

Saint Boi de Llobregat, a town near Barcelona

Boi music, a style of Central Amazon folk music now moving into the mainstream in Brazil

BOI, the airport code for Boise International Airport in Idaho

The Portuguese word for ox.

Boise Airport in Boise, Idaho, its IATA airport code.

Thailand Board of Investment, an agency of the Government of Thailand to promote investment in Thailand