Gwanak District is an administrative subdivision of Seoul, South Korea. It lies on the southern skirt of Seoul, bordering Anyang of Gyeonggi Province. The southern border of Gwanak-gu, bordering Anyang, consists of the craggy ridgeline of Gwanaksan, which dominates the local geography.
Originally a part of Siheung, Gyeonggi, it was transferred to Seoul with the rapid expansion of the National Capital Area and its population growth in 1960s. Partitioned from Yeongdeungpo District and established as a district in 1973, it now neighbours the Seocho, Dongjak, Guro, and Geumcheon Districts, and exercises jurisdiction over 21 neighbourhoods, with a population of 500,000.