Occupational Work Adjustment - Telecommunications (ACOL)
Office of the Worker Adviser - Ministry of Labour (OGA)
Optical Wholesalers Association - Later, OLA (EA)
Oregon Winegrowers Association (EARSL)
Organics-in-Water Analyzer - Instrumentation
Other Weird Arrangements (AMHC)
Outlook Web Access - Computer science (VLIE)
O.W.A. - NCIC firearms make code (NCIC)
Owase - Japan - Seismograph station code, US Geological Survey (SEIS)
Owatonna, MN - Location identifier - FAA (FAAL)
University of Windsor, Ontario - Library symbol - National Library of Canada (NLC)
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