| Ái Tử | |
| Settlement Type: | Township (Class-5) |
| Official Name: | Ái Tử township |
| Native Name: | Thị trấn Ái Tử |
| Pushpin Map: | Vietnam |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | North Central Coast |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quảng Trị |
| Subdivision Type3: | District |
| Subdivision Name3: | Triệu Phong |
| Unit Pref: | Imperial |
| Timezone: | UTC + 7 |
| Utc Offset: | +7 |
| Coordinates: | 16.7731°N 107.1619°W |
Ái Tử is a township (Vietnamese: thị trấn) and capital of Triệu Phong District, Quảng Trị Province, Vietnam.[1]