| Acronym | Definition |
|---|
| A&O➣Asterix & Obelix |
| A&O➣Alpha & Omega (band) |
| A&O➣Alert & Oriented (used by EMS-Ambulances) |
| A&O➣Admission & Orientation |
| A&O➣Allen and Overy (British legal firm) |
| A&O➣Automation and Drives (division of Siemens AG) |
| A&O➣Aware and Oriented |
| A&O➣Appalachian and Ohio Railroad |