Seo District (Korean: 서구; RR: Seo-gu; lit. West District) is the largest district in Incheon, South Korea. It has an area 111.2 square kilometres (42.9 sq mi), and it has the largest area of farmland in Incheon.

In the past, Seo-gu was part of 'Buk-gu'. In 1988, a part of the ward was separated to form 'Seo-gu'.

• 1413: Seokgot-myeon, Mowolgot-myeon, Bupyeongdoho-bu
• 1895: Seokgot-myeon, Mowolgot-myeon, Bupyeong-gun, Incheon-bu
• 1896: Seokgot-myeon, Mowolgot-myeon, Bupyeong-gun, Gyeonggi-do
• 1914: Seogot-myeon, Bucheon-gun
• April 1, 1940: Included in Incheon-bu
• August 15, 1949: Seogot Branch, Incheon
• January 1, 1968: Segot Branch, Buk-gu, Incheon
• July 1, 1981: Seogot Branch, Buk-gu, Incheon Direct Governing City

• January 1, 1988: Part of Buk-gu absorbed by Seo-gu
• March 1, 1995: Annex of Geomdan-myeon, Gimpo-gun, Gyeonggi-do.
• January 1, 2002: Division of Geomdan-dong into Geomdan-1-dong and Geomdan-2-dong.
• September 1, 2005: Sub-division of Geomdan-1-dong and Geomdan-2-dong into Geomdan-3-dong.
• September 1, 2006: Geomdan-1-dong sub-divided into Geomdan-1-dong and Geomdan-4-dong.
• September 17, 2008: Name change of Bulno-dong to Bullo-dong.
• June 10, 2010: Absorption of Cheongna-dong, of parts of Gyeonseo-dong-Yeonhui-dong-Wonchang-dong.
• July 9, 2012: Sub-division of Cheongna-dong into Cheongna-1-dong and Cheongna-2-dong.
• September 2, 2013: Sub-division of parts of Geomdan-1-dong (Oryu-dong, Wanggil-dong) into Geomdan-5-dong, and transfer of metropolitan area landfill from Geomamgyeongseo-dong to Geomdan-5-dong.

International schools:

• Cheongna Dalton School

• Geomam-Gyeongseo-dong (검암경서동)
• Sinhyeon-Wonchang-dong (신현원창동)
• Yeonhui-dong (연희동)
• Gajeong 1 to 3 Dong (가정1~3동)
• Seongnam 1 to 3 Dong (석남1~3동)
• Gajwa 1 to 4 Dong (가좌1~4동)
• Geomdan 1 to 4 Dong (검단1~4동)

• Cheongna International City

• Seo-gu homepage (in English)