Mount Hehuan (Chinese: 合歡山; pinyin: Héhuān Shān; Pe̍h-ōe-jī: Ha̍p-hoan-soaⁿ; also called Joy Mountain) is a 3,416-metre-high (11,207 ft) mountain in Central Taiwan. The peak lies on the border of Nantou and Hualien counties and is located within Taroko National Park. Hehuanshan is a popular destination in central Taiwan. The 3,421-metre east peak and 3,422-metre north peak of Hehuanshan are both higher than the main peak.

Mount Hehuan is part of the Central Mountain Range.

Snow, rare in the rest of Taiwan, is relatively common on Mount Hehuan during the winter months. Highway 14 leads to Wuling, a saddle between the main peak and the east peak of Hehuanshan. At 3,275 metres, Wuling is also the highest point of Taiwan accessible by highway. From Highway 14, a trail leads to the summit of the main peak. At the summit, there is a weather station.

In March 1913, Japanese surveyor Yasushi Noro [zh] attempted to scale Hehuanshan to conduct a survey of the area. However, he turned back after 89 Taiwanese members of his team died in a storm. This was the deadliest mountaineering disaster in Taiwanese history. Noro ascended Hehuanshan in October 1913 and completed the survey, which helped Japanese forces in the Truku War.

In the past, a military training area was built within proximity of Hehuanshan. The mountain range also features the remains of a ski lift, reportedly used by Taiwan's elite during the martial law period and inaccessible to most people. The unreliability of snowfall has meant that the ski lift was abandoned years ago. Remains of the ski lift mechanism are still visible to hikers on the east peak trail.

Highway 14 connects Puli, through Wushe (Ren-ai), and Qingjing Farm to Wuling. The narrow and winding road is considered a dangerous and difficult road. The road is often clogged in winter, when many locals travel up the mountain to see snow.

Highway 14 is currently the only available road crossing the Central Mountain Range via the famous Taroko Gorge. The Central Cross-Island Highway, which crossed the mountains north of Hehuanshan, was damaged during the September 21, 1999 earthquake and closed indefinitely.

• List of mountains in Taiwan