A&O
| 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 |