o to ONC

o	only
O&M	Organisation and Method
O&O	Oriental and Occidental Steamship Company
OA	Officier d'Académie
OAM	Medal of Order of Australia
OAS	Organisation of American States
OB	Order of Barbados
OBE	Officer of the Order of the British Empire
OBStJ	Officer Brother of the Order of St John of Jerusalem
OC	Officer Commanding
OC	Officer of the Order of Canada
OCF	Officiating Chaplain to the Forces
OCR	Oxford and Cambridge and RSA Examination Board
OCS	Officer Cadet School
OCTU	Officer Cadet Training Unit
ODA	Overseas Development Administration
ODI	Overseas Development Institute
ODM	Ministry of Overseas Development
ODPM	Office of the Deputy Prime Minister
OE	Order of Excellence (Guyana)
OECD	Organisation for Economic Co-operation and Development
OEEC	Organisation for European Economic Co-operation
OER	Officers' Emergency Reserve
OER&TC	Old Etonian Racquet and Tennis Club
offr	officer
OFMCap	Order of Friars Minor Capuchin (Franciscans)
OFMConv	Order of Friars Minor Conventual (Franciscans)
OFS	Orange Free State
OFT	Office of Fair Trading
OGS	Order of the Good Shepherd
OH	Ohio
OIC	Officer in Charge
OJ	Order of Jamaica
Okla	Oklahoma (USA)
OM	Member of Order of Merit
OMC	Oxford Military College
OMM	Officer of Order of Military Merit
ON	Order of the Nation (Jamaica)
ONC	Ordinary National Certificate

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