房山云居寺，又名西域寺，其全称为西域云居禅林，坐落于北京市房山区石经山西南麓，距北京城区75公里，原有建筑在抗日战争期间已毁，仅存塔数座和藏经洞中的石经。
云居寺为隋代高僧静琬所建，原有建筑依山而建，颇甚壮丽。静琬大师吸取南北朝灭佛运动中很多纸本、木刻佛经被毁，而石刻佛经多有保留的教训，就在山上凿石为室，刻石为经，用于保存佛经。刻经活动在随后的唐开元年间至辽代达到极盛，唐玄宗曾把《开元大藏经》赐给云居寺作为刻用底本，辽代时则使用《契丹藏》作为底本。这两部藏经现均已佚失，云居寺的石经就成为了校勘其他版本佛经的最好资料。
辽代时，藏经洞已放满了唐刻石经，便在山下新掘地穴储藏石经。刻经活动一直延续到明朝，总计共造石经14278方；同时藏纸本22000卷，木刻经77000余块，均为世界规模最大的佛教经藏。
除去石经，云居寺还保留有有唐代佛塔7座，辽代佛塔5座，堪称一绝。1981年11月27日，在对藏经洞之中的雷音洞进行修复时，意外发现了一个套函，其中藏有两颗释迦牟尼肉身舍利。
云居寺的门票是40元人民币，有一个停车场。
Yunju Temple is a Buddhist temple located in Fangshan District, 75 kilometers southwest of Beijing.
The temple was first built in the early seventh century. In 616, the first Buddhist stone scripture tablet was made at the temple by a monk named Jingwan. Because there were debates going between Buddhists and Daoists, and Jingwan feared reprisals from Daoists, he decided to carve his scriptures on stone instead of writing them on paper. The work on the stone tablets continued on for more than a thousand years before ending in 1655. In the Sui dynasty and early Tang dynasty, twelve sutras were carved. In the Liao dynasty and Jin dynasty, the Khitan Tripitaka (契丹大藏經) was carved and this is the only one of this version of the Chinese Buddhist canon surviving today。Carved on 77,000 wooden blocks the scriptures attract a large number of visitors.
In total, 1,122 Buddhist scriptures in 3572 volumes were produced at the temple. In the 1930s, a significant portion of the temple was destroyed. Two bone fragments believed to belong to the Buddha are enshrined at the site.
The temple contains a total of twelve pagodas from the Tang and Liao dynasties and three tomb pagodas from the Qing dynasty.
Yunjusi Temple ticket is ¥40 and there is a parking outside。