English abbreviations from oshc to osns
- OSHC (Outside School Hours Care)
- OSHCC (Outside School Hours Care Center)
- OSHCCs (Outside-School-Hours Care Centers)
- OSI (Open Source Initiative)
- OSIA ((U.S.) On-Site Inspection Agency)
- OSII (Operating System Interface Infrastructure)
- OSIM (Open Society Institute Montenegro)
- OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System (astronomical system on the Rosetta spacecraft))
- OSIRM (OSI Reference Model)
- OSIS (Open Source Information System)
- OS-JTF (Open Systems _ Joint Task Force)
- OSK (Oskarshamn Airport)
- OSL (Oslo Airport, Gardermoen (succeeding Oslo Airport, Fornebu))
- OSLA (Oklahoma Student Loan Authority)
- OSM (One Saturday Morning)
- O.S.M. (Ordo Servorum Mariae (Servites))
- OSMA (On-Site Maintenance Agreement)
- OSN (Orion Syndicate Network)
- OSNS (Open Systems Network Support)