The Cấn line (Vietnamese: chi Cấn; chữ Hán: 支艮; chi can also be translated to as branch) was the third dynasty of Hùng kings of the Hồng Bàng period of Văn Lang (now Viet Nam).

Starting 2524 BC, the line refers to the rule of Lân Lang and his successors, when the seat of government was moved to what is today Phú Thọ.

[1] Lân Lang was born approximately 2570 BC, and took the regnal name of Hùng Quốc Vương (雄國王) upon becoming Hùng king.

Since this time the different ethnic minorities of Vietnam were formed.

[4] Around 2500 BC, the Hùng king expanded rice cultivation.