Sir Robert Adair GCB (24 May 1763 – 3 October 1855) was a distinguished British diplomat, and frequently employed on the most important diplomatic missions. He was the son of Robert Adair, sergeant-surgeon to George III, and Lady Caroline Keppel, daughter of Willem Anne van Keppel, 2nd Earl of Albemarle. He was educated at Westminster School and the University of Göttingen, and then studied law at Lincoln's Inn, but hardly practised as a barrister. He became Whig Member of Parliament (MP) for Appleby (1799–1802) and Camelford (1802–12).