| A |
| Active Endeavour, Operation |
| Afghanistan, NATO's role in |
| Afghanistan, NATO's Senior Civilian Representative in - |
| African stabilization force, Contributing to the establishment of an - |
| African Union, NATO assistance to the |
| Air Command and Control System (ACCS), NATO |
| Air Defence, NATO |
| Alliance Ground Surveillance |
| Allied Command Operations (ACO) |
| Allied Command Transformation (ACT) |
| Armenia, NATO’s relations with |
| Arms control, Conventional - |
| Arms control, disarmament and non-proliferation in NATO |
| Auditors, International Board of - for NATO (IBAN) |
| Australia, NATO cooperation with - |
| Austria, NATO’s relations with |
| AWACS: NATO’s eyes in the sky |
| Azerbaijan, NATO’s relations with |
