Nanyang Fu Yamen, Government administrative building in Wancheng District, China.

Nanyang Fu Yamen is the former prefectural government office at 100 Minzhu Street in Wancheng District, Nanyang. The surviving complex measures 240 metres north to south and 150 metres east to west, covering 36,000 square metres, with more than 150 rooms. Its gatehouse has a grey tiled roof with upturned eaves, white walls framed by blue-and-green beams, and a central gateway beneath a black plaque with gold characters reading "南阳府署".

Nanyang Fu Yamen was first built in the Yuan dynasty, though its Yuan-era form is undocumented. In 1370 the Ming vice-prefect Cheng Benchu constructed the main hall and subordinate offices; repairs followed under Wang Chong (1440) and prefect Chen Yi. In 1897 prefect Fu Fengyang had county magistrates donate their salaries for a five-year restoration finished in 1901. The prefecture was abolished in 1913 and the site later housed the Henan Sixth Administrative Region office.

The name "Fu Yamen" refers to the office of the prefect (zhifu), the official who governed Nanyang Prefecture under the Yuan, Ming and Qing. The gatehouse plaque reads "南阳府署" in gold characters, and the building is entered through a central gateway in white walls framed by blue-and-green beams. Since 2001 it has been listed as a Major Historical and Cultural Site Protected at the National Level.

The complex runs 240 metres north to south and 150 metres east to west, so allow time to walk the full axis from the gatehouse inward. The site is at 100 Minzhu Street in Wancheng District. Guided tours are available and explain the halls' functions; the gatehouse entrance is flanked by black iron fencing.

The complex is the only surviving and fully regulated prefectural yamen in China, covering 36,000 square metres with 150 rooms. Its 240-metre north-south axis and 150-metre east-west width preserve the complete layout of a Qing-era prefecture office, from the gatehouse to the rear residences.