SEG or seg may refer to:

Organisations Society of Economic Geologists Society of Exploration Geophysicists Semaphore Entertainment Group, co-founder of the Ultimate Fighting Championship Southern Examining Group, a former English examining body Special Escort Group (Metropolitan Police), England Special Escort Group (Ministry of Defence Police) (SEG (MDP)), UK

Transport Penn Valley Airport IATA code Selling railway station, Kent, England (National Rail station code SEG) Shegaon railway station, Maharashtra, India (Indian Railways station code: SEG)

Other uses Smart Export Guarantee, a scheme which rewards export of electricity by small-scale low-carbon generators in the United Kingdom Supplementum Epigraphicum Graecum, new studies of ancient Greek inscriptions Ség., taxonomic author abbreviation of Jean-François Séguier (1703–1784), French botanist

See also Segment (disambiguation)