Seb is a diminutive of the given name Sebastian. "Seb" may also refer to:
- A god in Egyptian mythology also known as Geb
- SEB (band) a Danish Rock band
The abbreviation SEB can refer to:
- South Equatorial Belt, a belt of atmosphere of Jupiter
- The "Student Entertainment Board" of Washington State University
- Scottish Examination Board
- Single-event induced burnout, a type of radiation damage
- SEB, since 1997 the official name of the Swedish banking group Skandinaviska Enskilda Banken
- Groupe SEB, Société d'Emboutissage de Bourgogne, French consortium that produces small appliances
- Society for Experimental Biology
- Southern Electricity Board, a component of the British Electricity Authority
- Southern European Broadcasting, a division of the American Forces Network
- Spiez-Erlenbach-Bahn a railway line in Switzerland
- Staphylococcal Enterotoxin B
- Stockholms Enskilda Bank, the Swedish bank which became part of the Skandinaviska Enskilda Banken in 1972
- Super Eurobeat, a Japanese series of music CDs
- Surrogate Endpoint Biomarker SEB
- The code for Indian railway station SON_NAGAR
- The code for UK railway station Seaburn
- Sophie Ellis-Bextor, a British pop singer