Chinese diplomat and liberal statesman who was his country's first resident minister of modern times to be stationed in a Western country.

Guo served in various Chinese bureaucratic and administrative posts during the 1850s and '60s. He was notable for his advocacy of a peaceful response on China's part toward the growing Western presence in the area, a stance which prompted his fellow officials to accuse him of trying to gain favour with Westerners. In 1876 Britain and China signed the Chefoo Convention at Yantai (Chefoo), Shandong province, stipulating that China must send a minister to England. Guo was appointed and took up residence at the Court of St. James's in 1877. He was concurrently appointed minister to France in 1878 and briefly resided in Paris at that time. Guo, in his dispatches, urged his government to discard superstitions and to introduce railways, telegraph facilities, and modern mining methods into China.

Guo's advocacy of Westernization provoked such a tremendous outcry against him from officials at home that publication of the diary of his journey from Shanghai to London was halted and the printing blocks burned. The following year he was ordered to return to China. Fearing that his life would be in jeopardy if he appeared in the capital, he pleaded ill health and retired to his native village. He spent his later years teaching, writing, and advocating the modernization of China in order to regain an equal footing in relations with the West.