Rui'an (Chinese: 瑞安; pinyin: Ruì'ān, Wenzhounese: zy iu) is a county-level city along the southern coast of Zhejiang province, China, and is under the administration of Wenzhou City. It has a population of 1,125,000 people and covers a land area of 1,271 km2 (491 sq mi), 3,037 km2 (1,173 sq mi) when including water area.
Natives of the city speak the Rui'an dialect of Wu Chinese. Rui'an was recognized as the fourteenth development zone by the state department in 1987. Rui'an is also one of the top 100 cities for economic growth in China, and the people in Ruian are comparatively prosperous. In all, there 32 towns and villages under the administration of Rui'an city. In 1988, Ruian was listed by the State Council as one of the first counties and cities opening to the outside world, as well as one of the trial counties and cities for comprehensive economic reforms. Rui'an, also known as Meitou, has a history which goes back to about 2000 BC, when it became known for its machine production. The historic city began its trade and commerce in ancient times and saw busy streets and flourishing businesses. In the 2nd century BC it was called the Kingdom of Dong'ou.