SEM can refer to:

Computing

* Search engine marketing, promoting websites by increasing their visibility in search engine results * Security event manager, a security log tool used on data networks

Economics and management

* Stock Exchange of Mauritius, the principal stock exchange of the island country of Mauritius * Strategic enrollment management, an element of planning for new growth at a university or college

Energy

* Single Electricity Market, the integration of the electricity sectors of the Republic of Ireland and Northern Ireland in a single market * Strategic energy management, continuous improvement process for energy efficiency based on behavioral change

Mathematics and statistics

* Structural equation modeling, in data analysis * Simultaneous equations model, in econometrics * Standard error#Standard error of the mean, Standard error of the mean in statistics

Places

* Craig Field (Alabama), US airport, IATA code * Sem, Ariège, France * Sem, Norway

Science and technology

* Scanning electron microscope * Space Experiment Module, of the Freestar experiment#Space Experiment Module (SEM), Freestar experiment on space shuttle Columbia * ''Synthesizer expansion module'' in an Oberheim Electronics#Oberheim Electronics, Oberheim Electronics synthesizer * Sistema Eléctrico de Magallanes, an electrical power grid of Chile * SEM, instrument (seismometer) of the Surface Science Platform (Kazachok) mission ExoMars 2022 * A protecting group in organic chemistry, see 2-(Trimethylsilyl)ethoxymethyl chloride, 2-(trimethylsilyl)ethoxymethyl chloride (SEM-Cl)

Schools, organisations, societies

* The School of Ecclesiastic Music the school of Byzantine Music in Mount Lebanon * Swedish Evangelical Mission * Society for Ethnomusicology, an ethnomusicology in Indiana, US * School of Science and Engineering, Science and Engineering Magnet, a school in Dallas, Texas, US * S.E.M. Group civil engineering company based in South Australia * Steam Engine Makers' Society, early British trade union * Shandong Engineering Machinery, owned by Caterpillar Inc.

People

* Shem or Sem, one of the sons of Noah, as depicted in the Bible * Sem (given name), a usually masculine given name * Sem (artist) (1863–1934), French caricaturist * Elise Sem (1870–1950), Norwegian barrister, women's activist, and sports official * Ingebjørg Dahl Sem (born 1938), Norwegian Christian writer * Ingebjørg Sem (1931–2009), Norwegian actress * John Sem (born 1973), Papua New Guinean Olympic boxer * Niels Arntzen Sem (1782–1859), Norwegian politician * Suy Sem (born 1947), Cambodian politician

Other

* Dassault-Breguet Super Étendard, Super Étendard Modernisé, a French fighter aircraft * Self-evaluation maintenance theory, a psychological theory of self * New Austrian tunnelling method or Sequential Excavation Method * Sports medicine, Sports and exercise medicine {{disambig, surname