The Chefoo Convention, known in Chinese as the Yantai Treaty, was a treaty between Qing China and Great Britain. The official reason for the treaty was to resolve the "Margary Affair" but the final treaty included a number of other items.

The convention consisted of sixteen articles and was divided into three sections. The first section dealt with the resolution of the Margary Affair, calling for the punishment of the people implicated in the murder of Margary and stipulating that an indemnity be paid to Margary's relatives. The second section dealt with official intercourse between the two empires and specified the extraterritorial privileges of British subjects in China. The final section dealt with trade, prohibiting the levying of the Lijin (taxation) in the treaty ports, outlawing other forms of taxes on foreign goods, and opening a number of new treaty ports.

One practical result of the treaty was that the official mission of apology to Britain, led by Guo Songtao, became a permanent diplomatic mission in Britain, opening the way for a permanent foreign representation of China.