Tongmungwan[1] or Tongmunkwan[2] (Korean: 통문관; Hanja: 通文館) is a historic book store in Seoul, South Korea.

In 1934, 25 year old employee Lee Gyeom-ro (이겸로; 李謙魯[5]) acquired the business and renamed it Geumhakdang (금학당; 金港堂).

[6] Upon the outbreak of the 1950–1953 Korean War, Lee fled with an 80-volume set of books that documented the military history of Joseon for safekeeping.

[4] It reportedly made significant contributions to the study of Korean history, and served as a forum for the exchange of ideas between intellectuals.

[1] It reportedly began selling more general books by the 2010s, in order to afford the higher rent costs in Insa-dong.