Military abbreviations: O

A glossary of military-based abbreviations, acronyms and initials used throughout the First World War, the Second World War and through to present day. The abbreviations are associated with various different nations, primarily the United Kingdom but also including, India, South Africa, USA, New Zealand and Australia. Abbreviations also have a strong focus on various armed forces such as the British Army, Royal Navy and Royal Air Force. Use the browse prefix below to navigate to glossaries beginning with a specific letter.

Contents:  A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z
Abbreviation Definition 1 Definition 2 (if applicable)
OBE
Officer of the Order of the British Empire
OBLI
Oxfordshire and Buckinghamshire Light Infantry
OC
Officer Commanding
Officers Clerk (RN)
OCTU
Officer Cadet Training Unit
OL
Ordnance Lieutenant (RN)
OMGUS
Office of the Military Government (US)
OR
Other Ranks
ORB
Operations Record Book (RAF)
ORD
Ordinary Seaman (RN)
OS
Officers Steward (RN)
Ordinary Seaman (RN)
OSS
Office of Strategic Studies (US)
OTC
Officer Training Corps
O TEL
Ordinary Telegraphist (RN)
OTU
Operational Training Unit (RAF)
OWI
Office of War Information
OX & BUCKS LI
Oxfordshire and Buckinghamshire Light Infantry
OXF YEO
Oxfordshire Yeomanry