The Cong-Viettel FC

The Cong – Viettel Football Club (Vietnamese: Câu lạc bộ Bóng đá Thể Công – Viettel), commonly known as Thể Công or Viettel FC, is a Vietnamese professional football club based in Hanoi. The club is formally operated by Viettel Sports Center - an affiliation of Viettel Group - and competes in the V.League 1, the top tier of the Vietnamese football league system.

Thể Công – Viettel is the modern incarnation of Thể Công, was one of the most widely supported clubs and also one of the most successful club in Vietnamese football history, having won a record 19 national league titles, including 13 North Vietnam national titles and 6 V.League 1 titles after Vietnam's reunification. Thể Công also reached nine consecutive titles, from 1971 to 1979. The club has also contributed many great players to the national team.

Thể Công – Viettel's traditional colour is red, leading to the nickname Cơn lốc đỏ (Red Tornado). As Thể Công, they held a long-standing rivalry with Cong An Hà Nội (a club run by the Hanoi Police, not to be confused with the recently rebranded Cong An Hà Nôi), known as the "Hanoi Derby" or the "Vietnamese Clasico", from the mid-1950s to their dissolution in 2002. Nowadays, the derby is contested between The Cong – Viettel, Hanoi FC and the new Cong An Hanoi.