Uli Sigg (born 1946) is a Swiss businessman, diplomat and art collector.

[1] Sigg served as the Swiss Ambassador to China, North Korea and Mongolia from 1995 to 1998.

[1] Sigg became the largest private collector of contemporary Chinese art in the world.

[1] In 2012, he donated 1,463 works by 350 Chinese artists from his collection to the M+, a new museum in Hong Kong,[3] scheduled to open in 2019.

[7] The donation includes 26 works by Ai Weiwei and other works by "Ding Yi, Fang Lijun, Geng Jianyi, Gu Wenda, Huang Yongping, Liu Wei, Xu Bing and Zhang Xiaogang".