| Native Name: | 支兌 Chi Đoài |
| Conventional Long Name: | Đoài line Eighth dynasty of Hùng kings |
| Common Name: | Eighth dynasty of Hùng kings |
| Era: | Hồng Bàng period |
| Year Start: | 1431 B.C. |
| Year End: | 1332 B.C. |
| Life Span: | 1431 – 1332 B.C. |
| Event Start: | End of the Khôn line |
| Event End: | Beginning of the Giáp line |
| P1: | Khôn line |
| S1: | Giáp line |
| Capital: | Phong Châu |
| Government Type: | Monarchy |
| Title Leader: | Hùng king |
| Leader1: | Thừa Vân Lang |
| Year Leader1: | 1431 BC– |
The Đoài line (Vietnamese: chi Đoài; chữ Hán: 支兌; chi can also be translated to as branch) was the eighth dynasty of Hùng kings of the Hồng Bàng period of Văn Lang (now Vietnam). Starting 1431 B.C., the line refers to the rule of Thừa Vân Lang and his successors, when the seat of government was centered at Phú Thọ.[1]
Thừa Vân Lang was born approximately 1466 B.C. and took the regnal name of Hùng Vỹ Vương upon becoming Hùng king.[2] The series of all Hùng kings following Thừa Vân Lang took that same regnal name of Hùng Vỹ Vương to rule over Văn Lang until approximately 1332 B.C.