# SEI

Sei or SEI may refer to:

## Arts

* Sei (album), by Brazilian singer and composer Nando Reis
** "Sei", the title-song and first single from that album
* Sei (film), a 2018 Tamil thriller film

## Organizations and companies

* 7-Eleven, a popular multinational chain of gas stations and convenience stores
* Safety Equipment Institute, a private, non-profit organization established to test safety and protective products
* Scottish Episcopal Institute, the theological college of the Scottish Episcopal Church
* Script Encoding Initiative, a department at UC Berkeley supporting proposals for minor and historic scripts in the Unicode Standard.
* Scuba Educators International, a non-profit diver training organization
* SEI Investments Company, a financial services company headquartered in the United States
* Slough Estates International, the former name for Segro
* Smith Enterprise, a firearm and accessory manufacturing facility based in Tempe, Arizona that is known for making flash suppressors, muzzle brakes, sound suppressors, M14 rifles and accessories for M14 rifles.
* Software Engineering Institute, a federally funded research and development center at Carnegie Mellon University
* SpaceWorks Enterprises, a small aerospace engineering company in the United States
* Stockholm Environment Institute, a non-profit institute that specializes in sustainable development and environmental issues
* Sustainable Endowments Institute, a special project of Rockefeller Philanthropy Advisors, Inc, the Sustainable Endowments Institute (SEI) has pioneered research, education and outreach to advance resilient institutional responses to the climate crisis.
* Sumitomo Electric Industries, a manufacturer in automotive, information and communications, electronics, environment and energy, and industrial materials
* SUNY Eye Institute, a medical and basic sciences research institute in New York

## People
### Given name

* Shō Sei (1497–1555), king of the Ryukyu Kingdom from 1526 to 1555
* Shō Sei (r. 1803), king of the Ryukyu Kingdom in 1803
* Sei Fujii (1882–1954), Japanese male immigrant rights activist in the United States
* Sei Hatsuno (born 1976), Japanese male writer of mystery and thriller novels
* Sei Ashina (born 1983), Japanese actress
* Sei Kawahara (born 1995), Japanese male figure skater
* A member of girl group Weki Meki

### Surname

* Indrek Sei (born 1972), Estonian freestyle swimmer

## Other uses

* Sei whale, a baleen whale
* Se'i, traditional bacon from Timor, Indonesia
* Seebeck effect imaging, uses a laser to generate thermal gradients in conductors in order to locate electrically floating conductors
* Secondary electron image, a type of imaging in scanning electron microscopes to view sample topography
* Seri language, spoken in two Mexican villages
* Service endpoint interface, a term used in Java Platform, Enterprise Edition when exposing Enterprise JavaBean as web service
* Social-Emotional Intelligence (see Emotional Intelligence)
* Solid-electrolyte interphase (see Lithium-ion battery)
* Space Exploration Initiative, a plan envisioned by former U.S. President George H.W. Bush with crewed Moon and Mars missions
* Spanish East Indies, a former Spanish colony comprising the Philippines and most of Micronesia