SEP
- Cep (disambiguation)
- Hrvoje Sep
- IS-1 Sęp
- Polyestriol phosphate
- SEP Burundi
- SEP law
- SEP-IRA
- Samajik Ekta Party
- Secretariat of Public Education (Mexico)
- Sep (given name)
- Sepp (disambiguation)
- Seppe (disambiguation)
- Sept (disambiguation)
- September
- Septentrional
- Signaling End Point
- Socialist Equality Party
- Society for European Philosophy
- Solar Electric Propulsion
- Solar energetic particles
- Somatic experiencing
- Somatosensory evoked potential
- Somebody else's problem
- Special Support and Reconnaissance Company
- Specialna Enota Policije
- Splitterskyddad EnhetsPlattform
- Standard electrode potential
- Stanford Encyclopedia of Philosophy
- Stanford Exploration Project
- Strong equivalence principle
- Syringe exchange program
- Sęp, Świętokrzyskie Voivodeship