ASEC or asec may refer to:
Science and technology Absolute size-exclusion chromatography asec or arcsecant, an inverse trigonometric function Arcseconds or seconds of arc, a unit of angle .asec, the file extension of an Android secure encrypted file
Organisations ASEC Mimosas, a football club ASEC Ndiambour, a football club Alberta Students' Executive Council, an organization of post-secondary student leaders in Alberta, Canada Action Sports Environmental Coalition, a nonprofit organization co-founded by Bob Burnquist
Other Annual Social and Economic Supplement, a supplement to the Current Population Survey from the United States Census Bureau