| Type | Military alliance |
| Purpose | Collective defence; peacekeeping |
| Established | 4 April 1949 |
| Headquarters | Brussels, Belgium |
| Member states | United States • Canada • Turkey • United Kingdom • France • Germany • Italy • Belgium • Netherlands • Luxembourg • Portugal • Spain • Denmark • Iceland • Norway • Greece • Albania • Croatia • Czech Republic • Estonia • Hungary • Latvia • Lithuania • Montenegro • North Macedonia • Poland • Romania • Slovakia • Slovenia • Bulgaria |
| Official languages | English • French |
