OPSO

AcronymDefinition
OPSOOuachita Parish Sheriff Office (Monroe, LA)
OPSOOperations Officer
OPSOOlder People Speak Out (Australia)
OPSOOn Public Service Only (postage; New Zealand)
OPSOOsteopathic Physicians and Surgeons of Oregon (Portland)
OPSOOver Pressure Shut-Off (valve)
OPSOOpen Software (Italian software and web services company)
OPSOOffice of Pipeline Safety Operations (US DOT)
OPSOOverlapping Pairs Sparse Occupancy Test (random number generators)