Sai or SAI may refer to:
Companies
- Science Applications Incorporated, original name of Leidos
 - ICAO designator for Shaheen Air, a Pakistani airline
 - Skandinavisk Aero Industri, a former Danish aeroplane manufacturer
 - Software Architects, Inc., a North American computer software company
 - Springfield Armory, Inc., an American firearm manufacturer and importer
 - Supersonic Aerospace International, an American aerospace firm
 
Fiction
- Fujiwara no Sai, a character in Hikaru no Go media
 - Sai (Naruto), a character in Naruto media
 - Hinoki Sai, a character in the Betterman universe
 - Sai Akuto, protagonist of Ichiban Ushiro no Dai Maō
 - Sai Argyle, a fictional character in the manga and anime Gundam series
 - Sai, a term of respect in Stephen King's The Dark Tower universe
 - Sai no Hanaya, a character in the Yakuza series
 
Government
- Solar America Initiative
 - Sports Authority of India, an Indian government body
 - Supreme audit institution, a government audit body
 
Media
- Sai music, a traditional style of music from southern Chad
 - Scaled and Icy (2021), sixth studio album by the American musical duo, Twenty One Pilots
 
Military
- Senior Army Instructor, in United States Army Junior ROTC
 - South African Infantry Corps
 - Sai (weapon), an Asian melee weapon
 
Places
- Sai, Orne, a French village and commune
 - Sai, Bhiwani, Haryana, India
 - Sai (Mawal), a village in Pune district, Maharashtra, India
 - Sai, Raebareli, a village in Uttar Pradesh, India
 - Sai, Aomori, a village in Japan
 - Lake Sai, one of the Fuji Five Lakes in Japan
 - Saï (island), on the Nile in Sudan
 - Sai River (disambiguation)
 
Organisations
- SAI Global, Australian standards organisation
 - Sathya Sai Organization, religious organization
 - Scout Association of Ireland, 1908-2004
 - SAI Ambrosini, an Italian aircraft manufacturer
 - Society of American Indians, 1911-1923
 - Society of Architectural Illustrators
 - Sweet Adelines International, women barbershop singers
 
People
Groups
- Sai people or Li people, a minority Chinese ethnic group
 - Sai (caste)
 
Given name
- Sai Kiran Adivi, Indian film director and producer
 - Sai Prathap Annayyagari (born 1944), Indian politician
 - Sai Bennett (born 1990), British actress and model
 - Sai Deodhar (born 1984), Indian television actor
 - Sai Mauk Kham (born 1950), ethnic Shan politician and one of the two vice presidents of Myanmar
 - Sai Kiran (born 1978), Indian actor who works in the Telugu film industry
 - Sai Wing Mock (1879–1941), New York Chinese criminal and leader of the Hip Sing Tong
 - Sai Pallavi (born 1992), Indian actress
 - Sai Paranjpye (born 1938), Indian movie director and screenwriter
 - Sai Sam Tun, owner of the Loi Hein Co, Ltd. of Myanmar
 - Sai Yinjiya (born 1976), male Chinese freestyle wrestler
 
Surname
- Anand Sai, Indian art director who works for Telugu films
 - Manoj Sai, Indian cricketer
 - Marlene Sai (born 1941), Hawaiian singer
 - Nand Kumar Sai (born 1946), Indian politician from Chhattisgarh state
 - Obodai Sai (born 1984), Ghanaian boxer
 - Sai On (1682–1761), scholar-official of the Ryūkyū Kingdom
 - Ryouji Sai (born 1980), Japanese professional wrestler
 - Veer Surendra Sai (died 1884), Indian freedom fighter
 - Vishnudeo Sai (born 1964), member of the 14th Lok Sabha of India
 - Yōichi Sai (born 1949), Japanese film director
 
Other people
- Sai, real name Simon Wimmerberg, DJ/producer with the band Labyrint
 - Sai Htee Saing (1950–2008), Burmese singer and songwriter of Shan descent
 - Sai Maa (born 1953), Mauritian guru
 
Research institutes
- University of Texas at Austin South Asia Institute, USA
 - South Asia Institute (Germany)
 - Stan Ackermans Institute, in the Dutch city of Eindhoven
 - Sternberg Astronomical Institute, a division of Moscow State University in Russia
 
Science and technology
- SAI (software), painting software
 - Serving area interface, or service area interface, an outdoor telecommunications cabinet
 - Silent Aircraft Initiative, Cambridge-MIT Institute project
 - Single-collateral Dai (cryptocurrency), discontinued
 - Stratospheric aerosol injection in climate engineering
 - Subject–auxiliary inversion in linguistics
 
Other uses
- Sai (deity), an Egyptian god
 - Steering Axis Inclination, a secondary wheel alignment measurement
 - Toyota Sai, alternate name for the Lexus HS hybrid car
 - Self-assessed intelligence
 
See also
- Sai Baba (disambiguation), an honorific term for ascetics in India
 - Sain (disambiguation)
 - Sais (disambiguation)
 
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