SEC
- Apollo TV camera
- Dalek Sec
- Education in Malta
- Glossary of musical terminology
- Long-running transaction
- Mercedes-Benz SEC
- SEC Armadillo
- SEC Centre
- SEC experiment
- Samsung Electronics Co., Ltd.
- Scottish Episcopal Church
- Sec (wine)
- Secant function
- Second
- Section (disambiguation)
- Section (typography)
- Securities and Exchange Commission (disambiguation)
- Selenocysteine
- Seč (disambiguation)
- Size-exclusion chromatography
- Solar Entertainment Corporation
- Southeast Conference (Wisconsin)
- Southeastern Conference
- Space Weather Prediction Center
- Speedway European Championship
- St Edmund's College, Ipswich
- State Electricity Commission of Victoria
- State Examinations Commission
- State-owned Enterprises Commission
- Sxc (disambiguation)
- United States Securities and Exchange Commission