OSS
OSS may refer to any of the following:
- Office of Strategic Services, World War II forerunner of the Central Intelligence Agency
- O.S.S. (film), a 1946 film about the Office of Strategic Services
- Oakley Strategic Services, Delivers Integrated Operational and Technical Security Solutions, Services and Support to the US Government and the US Private Sector.
- Open Sound System
- Open-source software
- Operations Support Systems, computers used by telecommunications service providers to administer and maintain network systems
- Operations Support Squadron
- Out of School Suspension
- Optimized Systems Software, a former software company
- the Old Syriac Sinaiticus, a Bible manuscript
- OSS (series), the name of an ITC Entertainment TV series which aired in 1957.
- ÖSS (Öğrenci Seçme Sınavı), the only university entrance exam in Turkey
- Outram Secondary School
- Oss, a city and municipality in the Netherlands
- The Office for Science and Society in Montreal