Ui-dong (Korean: 우이동) is a dong (neighbourhood) of Gangbuk District, Seoul, South Korea.

Thus Ui-dong can be called either legal dong or administrative dong.

Uido-dong is named after the geographical features of the area, where the tributary of the Han River, called Soguinai, flows through a valley, resembling the shape of a cow's ear.

This area is also known for the peaks of Baegundae and Insubong in Bukhansan, which resemble the ears of a cow.

This Seoul location article is a stub.