SEI

For other uses, see Sei (disambiguation).

SEI may stand for:

• Safety Equipment Institute, a private, non-profit organization established to test safety and protective products
• Scuba Educators International, a non-profit diver training organization
• Seebeck effect imaging, uses a laser to generate thermal gradients in conductors in order to locate electrically floating conductors
• Service endpoint interface, a term used in Java Platform, Enterprise Edition when exposing Enterprise JavaBean as web service
• Slough Estates International, the former name for SEGRO
• Software Engineering Institute, a federally funded research and development center at Carnegie Mellon University
• Space Exploration Initiative, a plan envisioned by former U.S. President George H.W. Bush with manned Moon and Mars missions
• SpaceWorks Enterprises, Inc., a small aerospace engineering company in the United States
• Stockholm Environment Institute, a non-profit institute that specializes in sustainable development and environmental issues
• SUNY Eye Institute, a medical and basic sciences research institute in New York
• Spanish East Indies, a former Spanish colony comprising the Philippines and most of Micronesia