SEG
- Jean-François Séguier
- Penn Valley Airport
- Segment (disambiguation)
- Selling railway station
- Shegaon railway station
- Smart Export Guarantee
- Society of Economic Geologists
- Society of Exploration Geophysicists
- Southern Examining Group
- Special Escort Group (Metropolitan Police)
- Special Escort Group (Ministry of Defence Police)
- Supplementum Epigraphicum Graecum
- Ultimate Fighting Championship