La Thành is the Vietnamese form of the Chinese placename Luocheng formerly romanized as Lo-cheng.
It may refer to:
Long Biên (Chinese: Longbian), within present-day Hanoi Tống Bình (Chinese: Songping), within present-day Hanoi Thăng Long, Hanoi proper, particularly Đại La, the old fortress around which the city grew up Other Luochengs within China