| Acronym | Definition |
|---|
| OPO➣Openbaar Primair Onderwijs (Dutch: Public Primary Education) |
| OPO➣Open Purchase Order (procurement) |
| OPO➣Organ Procurement Organization |
| OPO➣Office of Procurement Operations (US DHS) |
| OPO➣Ophthalmic and Physiological Optics (publication; Wiley) |
| OPO➣Osaka Philharmonic Orchestra (Japan) |
| OPO➣Oracle Power Objects |
| OPO➣Optical Parametric Oscillator(s) |
| OPO➣Office of the Permanent Observer (Inter-Parliamentary Union) |
| OPO➣Overnight Pulse Oximetry (pulmonary disease) |
| OPO➣Porto, Portugal - Porto (Airport Code) |
| OPO➣Office of Public Outreach (NASA) |
| OPO➣Observation Post Officer |
| OPO➣Other People's Opinions |
| OPO➣One Person Operated |
| OPO➣Operations Order |
| OPO➣Opposite Polarity |
| OPO➣Office of Provincial Outreach |
| OPO➣OPNAV Principal Official |
| OPO➣Ovamboland People's Organization |
| OPO➣Office of Personnel Operations |
| OPO➣Orbiter Project Office |
| OPO➣Psion OPL Output (executable file extension) |
| OPO➣Outpatient Observation |
| OPO➣One Production Only (acting contracts) |
| OPO➣Operational Performance Objectives |
| OPO➣Orbiting Planetary Observatory |
| OPO➣Oil Pressure Out |
| OPO➣Over-Pressure Operations |
| OPO➣Ohio Peace Officer |