Hapjeong-dong (Korean: 합정동; Korean pronunciation: [hapt͈ɕʌŋdoŋ]) is a dong (neighborhood) of Mapo District, Seoul, South Korea.

• Administrative divisions of South Korea

Originally, Hapjeong-dong was a part of Yeonhui-bang, a division of Seoul that encompassed approximately Seodaemun District and the western part of Mapo District. The meaning of Hapjeong-dong, written in Hanja as 蛤井洞, was "clam well". Later the Hanja transcription of Hapjeong was changed to 合井.

After the Japan–Korea Annexation Treaty of 1910, Hapjeong-dong was known as Hapjeon-ri in 1913 and Hapjeong-jeong in 1936; it was a part of Yeonhui-myeon, which extended from Seodaemun District to Yeouido. In 1944, it became a part of the newly created Mapo District district and received its current name in 1946.

Hapjeong-dong contains the following main streets, which also give their name to surrounding, smaller streets according to the new address system in South Korea:

• Donggyo-ro separates Hapjeong-dong from Mangwon-dong;
• Dongmak-ro;
• Huiujeong-ro: the name of this street is the former name of Mangwonjeong, a pavilion built by his brother near the Han river;
• Poeun-ro: the name refers to the pen name of Chŏng Mong-ju, whose statue stands at one end of the street;
• Seonji-gil;
• Tojeong-ro;
• Yanghwajin-gil: the name refers to Yanghwagin, a former port and ferry dock on the Han riverside;
• Yanghwa-ro: leads to Yanghwa Bridge, near the former site of the Yanghwajin ferry dock;
• Worldcup-ro: leads to the Seoul World Cup Stadium and separates Hapjeong-dong from Seogyo-dong.

A few historical landmarks may be found in Hapjeong-dong:

• Mangwonjeong was a pavilion built in 1424 by Prince Hyoryeong, elder brother of King Sejong, to oversee farming every spring and fall. Its first name, "Huiujeong" ("a pavilion meeting a delightful rain"), was given by King Sejong after seeing the field getting wet by rain during a visit. Later, Prince Wolsan, brother of King Seongjong, inherited the pavilion and renamed it "Mangwongeong". The pavilion was damaged by a flood in 1925 and rebuilt in 1989. Nowadays it is accessible from Donggyo-ro 8an-gil and oversees the Han river expressway.
• Yangwhajin was a port and ferry dock on the Han riverside, located near Jeoldu-san. It used to be an important entry point to Seoul.
• Jeoldu-san is a rocky promontory that oversees the Han river near the Dangsan Railway Bridge, with a shrine and park dedicated to Christian martyrs.
• Yanghwajin Foreigners' Cemetery, located near Jeoldu-san.

Other notable sites in Hapjeong-dong include:

• Yanghwa Bridge, that connects to Seonyu-do and the Han river south bank.
• the Seoul Thermal Power Station, also partly located in Dangin-dong.

A number of companies specialized in music or media are located in Hapjeong-dong, included YG Entertainment.

The area is served by subway via Hapjeong station ( and ), and Sangsu station (). Also, various Seoul bus lines reach the street.

• "Chronicle of Beopjeong-dong and Haengjeong-dong" (in Korean). Guro District Official website. Archived from the original on 2014-10-06. Retrieved 2008-05-11.
• "Mapo Information". The chart of legal dong assigned by administrative dong (행정동별 관할 법정동 일람표) (in Korean). Mapo District Official website. Archived from the original on 2007-11-05.

• Mapo District official website in English
• Map of Mapo District at the Mapo District official website
• (in Korean) Map of Mapo District Archived 2007-11-05 at the Wayback Machine at the Mapo District official website
• (in Korean) Hapjeong-dong resident office website

37°32′58″N 126°54′20″E / 37.54946°N 126.90566°E / 37.54946; 126.90566