Seongbuk District (Korean: 성북구; RR: Seongbuk-gu) is one of the 25 districts of Seoul, South Korea.

The district is located in the mid-north part of the city.

Seongbuk District was established under Presidential Decree No.

159 on August 13, 1949 (including some areas of Dongdaemun District and some areas of Sungin-myeon, Goyang-gun), and was promoted to a autonomous district by implementing a Gu-level local government on May 1, 1988.

Seongbuk District consists of 20 administrative dongs (haengjeong-dong, 행정동) and 39 legal dongs (beopjeong-dong, 법정동).