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Siheung
Siheung; 시흥
	— Municipal City —
Korean transcription(s)
- Hangul	시흥시
- Hanja	始興市
- Revised Romanization	Siheung-si
- McCune-Reischauer	Sihŭng-si
	; Emblem of Siheung
	; Emblem of Siheung
Country	South Korea
Region	Sudogwon
Administrative divisions	11 dong
	Area
- Total	131.46 km2 (50.8 sq mi)
	Population (2005)
- Total	441,147
- Density	3,355.8/km2 (8,691.5/sq mi)
- Dialect	Seoul

Siheung is a city in Gyeonggi Province, South Korea.

In the early Three Kingdoms period, the Siheung area was part of the Baekje kingdom. It was lost to Goguryeo along with the Han River valley in 475.

Siheung acquired its current administrative identity on January 1, 1989, when the old county of Siheung was divided into the cities of Siheung, Gunpo, and Uiwang. At the time Siheung city had a population of only 93,000. This number more than tripled in the following decade, as massive suburban apartment complexes were developed.

Notable landmarks include Oi Island, Mount Sorae, and the port and inlet of Wolgot. Siheung includes two new cities that were developed in the 1990s, Sihwa and Wolgot New City. The new city of Sihwa includes a very large industrial complex. Companies headquartered there include Hansung Machinery Co. Korea Polytechnic University established in 1997, and also Kyonggi Institute of Technology established in 1998.

In 2006, Korea Polytechnic University built TIP(Techno Innovation Park) of 18 floors for studying, research, and development with companies, university, and government together during several years. This building always opens since March, 2007.