Max Baucus, American lawyer, politician, and diplomat, 11th United States Ambassador to China

Maxwell Sieben Baucus is an American politician who served as a United States senator from Montana from 1978 to 2014. A member of the Democratic Party, he was a U.S. senator for over 35 years, making him the longest-serving U.S. senator in Montana history. President Barack Obama later appointed Baucus to replace Gary Locke as the 11th U.S. Ambassador to the People's Republic of China, a position he held from 2014 until 2017.

The United States ambassador to China is the chief United States diplomat to the People's Republic of China. The United States has sent diplomatic representatives to China since 1844, when Caleb Cushing, as commissioner, negotiated the Treaty of Wanghia. Commissioners represented the United States in China from 1844 to 1857. Until 1898, China did not have a system in place for the Emperor to accept the Letters of Credence of foreign representatives. From 1858 to 1935, the United States representative in China was formally Envoy Extraordinary and Minister Plenipotentiary to China. The American legation in Nanjing was upgraded to an embassy in 1935 and the Envoy was promoted to Ambassador Extraordinary and Plenipotentiary.