Xian Shan, Mountain summit in Taiwan.

Xian Shan, also called Hongmao Guan Shan, is a 967 m summit on the border of Xindian and Yongxing villages in Shitan Township, Miaoli County, and Penglai village in Nanzhuang Township. It is one of Taiwan's Minor Hundred Peaks, and its wooded slopes hold the Xian Shan Xieling and Lingdong temples, built into the hillside below the top.

Xian Shan, also called Hongmao Guan Shan, lies on the border of Xindian and Yongxing villages in Shitan Township and Penglai village in Nanzhuang Township, Miaoli County. Its summit, 967 m high, is listed among Taiwan's 100 Minor Peaks. A third-class triangulation point, No. 4196, once stood on top but is thought to have been lost to a landslide.

The name Xian Shan, "Immortal Mountain", is tied to the Xianshui Pavilion (仙水亭) on the mountain. The slopes hold two well-known temples, Xian Shan Xieling Gong and Lingdong Gong, which draw pilgrims and give the peak its religious role. The summit's old third-order triangulation point No. 4196 is thought to have been lost to a landslide.

Access is normally via County Road 124, which serves the trailheads near the Xianshan Xieling Temple and Lingdong Temple. The summit lies on the border of Shitan and Nanzhuang townships in Miaoli County, and the 967 m top holds no trig point: the level-three marker 4196 is thought lost to a landslide.

The summit's third-order triangulation point, numbered 4196, is no longer there, apparently lost to a landslide. The peak also marks the divide between two river systems: the Nan River of the Zhonggang River basin and the Shitan River (Xindian Creek) of the Houlong River basin.