Boi or BOI may refer to:

• Paolo Boi (1528–1598), Italian chess player
• Big Boi (born 1975), rapper
• Boi-1da (born 1986), Canadian hip-hop producer
• Boi, one of the Catalan forms of the name Baudilus

• Boí, a village in Catalonia, Spain
• Boi, Khyber Pakhtunkhwa, a village and union council in Pakistan
• Sant Boi de Llobregat, a town near Barcelona, Spain
• Sant Boi de Lluçanès, a town in Osona, Catalonia
• Boise Airport (IATA: BOI, FAA LID: BOI), an airport in the US state of Idaho

• The Bank of Industry (BOI), Nigeria's oldest development finance institution
• Board of Investment of Mauritius, the investment promotion agency of Mauritius
• Pakistan Board of Investment, the investment promotion agency of Pakistan
• Bureau of Investigation, a bureau of the U.S. Dept. of Justice, became the Federal Bureau of Investigation in 1935
• Bank of Ireland, one of Ireland's largest commercial banks
• Bank of India, one of India's largest commercial banks
• Thailand Board of Investment, an agency of the Government of Thailand to promote investment in Thailand

• "Sk8er Boi", a 2002 song by Avril Lavigne
• Boi (music), a style of Central Amazon folk music
• Boi (film), a 2019 Spanish thriller

• BOI, the ICAO code for 2GO
• Boi (slang), as a spelling that is deliberately altered for reasons of gender identification, sexuality, or group affinity
• Bôi River, Vietnam
• Dat Boi, an internet meme that features an animated frog riding a unicycle

• Boy (disambiguation)
• Sant Boi (disambiguation)
• Boii, an Iron Age Gallic tribe
• Boii (genus)