Oncology Nursing Society 
Operational Needs Statement 
Office for National Statistics 
Operational Need Statements 
One Night Stand 
Optical Networking System 
Office of National Statistics 
Omega Navigation System 
Onboard Navigation Systems 
Operational Needs Statements 
Object Name Service 
Object Numbering System 
Obstacle Neutralization System 
Off Nominal Situations 
Office for NATO Standardization 
Office of NATO Standardization 
Office of Naval Science 
Office of Newcomer Services 
Office of Nuclear Safety 
Office of Nursing Services 
Oligodeoxynucleotides 
oligonucleotides 
On Premise Station 
Onions 
OnSlaught 
Open Network Service 
Open Networking System 
Operational Need Statement 
OPEX Networking Solution 
optic nerve section