The Flag Tower of Hanoi, or Cột cờ Hà Nội, is a tower in Hanoi, Vietnam, and one of the city's symbols. It stands 33.4 meters tall, or 41 meters with the flag on top. It was built in either 1805 or 1812, during the Nguyen dynasty, as an observation post for the Hanoi Citadel. Unlike many structures in Hanoi, it was not destroyed during the French invasion of 1896 and 1897, and it remained in continuous use as a military post.
The tower has three tiers and a pyramid-shaped upper section, with a spiral staircase inside leading to the top. The first tier is 42.5 meters wide, and the second has four doors. The tower is lit by 36 flower-shaped windows and six fan-shaped windows.
From 1956 to 2024 it stood within the grounds of the Vietnam Military History Museum. It now belongs to the Imperial Citadel of Thang Long.
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