The Grass Mountain Chateau (Chinese: 蔣公草山行館; pinyin: Jiǎng Gōng Cǎoshān Xíngguǎn; Pe̍h-ōe-jī: Chiúⁿ-kong Chháu-soaⁿ Hêng-koán) is a former residence of late President of the Republic of China Chiang Kai-shek.

The Grass Mountain Chateau, a building surrounded by a partially landscaped 7,200 square meters (78,000 sq ft) site, was built by Taiwan Sugar Corporation in 1920.

When in 1949 the Republic of China government fled from Nanking to Taipei in Taiwan, Kuomintang leader Chiang Kai-shek claimed the chateau as his first official residence.

The site served as Chiang's main residence for a year until a mansion closer to central Taipei could be completed.

After the shift of Taiwan society to modern democracy in the 1990s, the chateau and its grounds served as both a historical museum and an art exhibition center, both of which are open to the public.