SEK may stand for:
- SEK, ISO 4217 currency code of the Swedish krona, the currency of Sweden
- Federation of Swiss Protestant Churches (Schweizerischer Evangelischer Kirchenbund)
- SEK Studio, a North Korean animation studio
- Stagecoach in East Kent
- Sidirodromoi Ellinikou Kratous, the Hellenic State Railways (Σιδηρόδρομοι Ελληνικού Κράτους, Greece, 1920-1970)
- Spezialeinsatzkommando (German Police Special Operation Unit)
Sek may refer to:
- alternate name of Sehk, a village in South Khorasan Province, Iran
Read more about SEK: People