OCG

Office of Government Commerce
Found on http://www.abhi.org.uk/glossary/default.xhtml

OCG

OCG: Oral cholecystogram.
Found on http://www.medterms.com/script/main/art.asp?articlekey=24959

OCG

Operational Command Group
Found on http://www.met.police.uk/foi/glossary.htm
No exact match found