Саньшаньмяо, Buddhist temple in Shijingshan District, China.

Sanshan Nunnery (三山庵) is a small Han Buddhist temple in Badachu Park, Shijingshan District, Beijing, the third of the park's eight sites. It is a courtyard facing northeast, with a three-bay gate hall, a five-bay main hall flanked by two side rooms, and east and west side halls. The gate hall bears the plaque "三山菴" and the couplet "翰墨因缘旧，烟云供养宜".

Tradition holds that Sanshan'an was founded in 1151, the third year of the Jintian De era of the Jin dynasty. A 1936 Beiping temple register instead records it as built in the Tang and rebuilt in 1763, the 28th year of the Qianlong reign; the present buildings date from the Qing. It was also called Sansheng'an after its statues of Liu Bei, Guan Yu and Zhang Fei.

The temple is also called Sansheng'an after the three sworn brothers of the Romance of the Three Kingdoms, Liu Bei, Guan Yu and Zhang Fei, once worshipped here. The gate hall now holds three 2010 statues of the wealth gods Guan Gong, Zhao Gongming and Bi Gan. The name 'an' reflects its small size.

The temple is accessible by subway line 1 to Pingguoyuan station, after which a walk north leads you to the location. The site sits in a mixed neighborhood with both modern and older buildings, making it fairly straightforward to navigate.

The name means "Three Mountains," yet the temple does not actually stand between the three peaks: the true spot between Cuiwei, Jue and Lushi mountains is around the Tongji Bridge, between Sanshan'an and Zhengguo Temple. The temple is also called Sansheng'an after Liu Bei, Guan Yu and Zhang Fei, once worshipped here.