Seodaemun District (Seodaemun-gu) is a gu located in northwestern Seoul, South Korea. The name derives from Seodaemun, meaning literally "Great West Gate", which was once located in the district. Seodaemun was one of the four great gates of the city wall surrounding the Joseon capital of Hanyang (only Dongdaemun and Namdaemun survive intact, though the latter was destroyed by arson in 2008 and only recently rebuilt).