SE

Se may stand for:
* Se (kana) (せ and セ), one of the Japanese kana
* Northern Sami language, ISO 639-1 code
* Selenium, chemical element
* Se (instrument) (瑟)Traditional Chinese musical instruments

SE may stand for:
* Schola Europaea
* Ferrocarriles Unidos del Sureste, AAR reporting mark
* Macintosh SE "System Expansion", a personal computer manufactured by Apple
* "Mercedes-Benz SE", automobile, see Mercedes-Benz W108
* Schloss Einstein, a German (famous) television program for children and teenagers
* Scottish Executive, the Scottish Government, the executive arm of the Scottish Parliament; and the civil service serving that government
* SE Electronics, a microphone manufacturer based in Shanghai
* Sex education
* Manually Coded English or Siglish
* Single-ended, signalling method used in the SCSI standard
* "Societas Europaea", European public company, see European Company Statute
* Software engineering
* Somatic Experiencing, a form of psychological therapy
* Sony Ericsson, a mobile phone company formed by Sony and Ericsson
* Southeast, one of the four ordinal directions, in weather forecasting and geography
* Spaceship Earth
* Special edition
* Square Enix, a video game company
* Standard error (statistics), standard deviation of a sample normalized by the square root of the sample size
* Star Airlines, IATA airline designator
* Stock exchange
* "Super Extra", in relation with a car body style
* Sweden, Iso country code
* Systems Engineering
* SE postcode area of London
* Sergipe (SE), a Brazilian state