The Convention of Lhasa (), officially the Convention Between Great Britain and Thibet, was a treaty signed in 1904 between Tibet and Great Britain, in Lhasa, the capital of Tibet, then under administrative rule of the Qing dynasty. It was signed following the British expedition to Tibet of 1903–1904, a military expedition led by Colonel Francis Younghusband, and was followed by the Anglo-Chinese Convention of 1906.