OSEC can stand for: Occupy the SEC Former name of Enefit American Oil (former name: Oil Shale Exploration Company - OSEC) Open Science European Conference Office of the Secretary of US departments or commissions OSec (formerly OccamSec), a New York-based computer security company On-Site Hypochlorite Generation Systems, a registered trademark of Xylem Inc. Office Suisse d’Expansion Commerciale (Switzerland Global Enterprise)