Gangseo District (Gangseo-gu) (Hangul: 강서구, Hanja: 江西區, Korean pronunciation: [ka̠ŋ.sʰʌ̹.ɡu]) is one of the 25 wards (gu) of Seoul, South Korea. It is located on the south side of the Han River. Gimpo Airport is in Gonghang-dong, where many flights fly to cities like Busan, Jeju, and Gwangju. Among the Administrative divisions are: Balsan-dong (발산동 鉢山洞) • Banghwa-dong (방화동 傍花洞) • Gaehwa-dong (개화동 開花洞) • Deungchon-dong (등촌동 登村洞) • Gayang-dong (가양동 加陽洞) • Magok-dong (마곡동 麻谷洞) • Gonghang-dong (공항동 空港洞) • Gwahae-dong (과해동 果海洞) • Ogok-dong (오곡동 五谷洞) • Osoe-dong (오쇠동 五釗洞) • Hwagok-dong (화곡동 禾谷洞) • Yeomchang-dong (염창동 鹽倉洞).
The Korea Airports Corporation headquarters, Korean Air's headquarters, Korean Airport Service, Ltd., and Air Total Service are located in Gonghang-dong in Gangseo District. Asiana Airlines's headquarters are located in Asiana Town in Osoe-dong, Gangseo District. Jin Air has its headquarters in Deungchon-dong, Gangseo District. Eastarjet has its headquarters in Banghwa 2-dong. The Aviation and Railway Accident Investigation Board (ARAIB) FDR/CVR Analysis and Wreckage Laboratory is on the property of Gimpo International Airport in Gwahae-dong, Gangseo District. Previously the ARAIB had its headquarters in Gonghang-dong, Gangseo District. The ARAIB headquarters are now in Sejong City. Attractions include: Heojun Museum • SBS Open Hall
Gangseo-gu has a population of over 546,938 people. Gangseo-gu also forms part of the wider Seoul metropolitan area which has a population of over 9,963,000 people.