Robert Sutton, 2nd Baron Lexington PC (6 January 1662 – 19 September 1723) was an English diplomat.
On 14 September 1691, he married Margaret, (d. April 1703), the daughter of Sir Giles Hungerford of Coulston, Wiltshire, by whom he had three children: He served as a captain of a troop of horse, resigning his commission in 1686.
Lexington was again sent abroad in 1694 as envoy extraordinary to the Court in Vienna, and served until the Treaty of Ryswick was concluded in 1697.
His letters from Vienna, selected and edited by H. M. Sutton, were published as the Lexington Papers (1851).
Lexington's barony became extinct on his death, but his estates descended to Lord Robert and Lord George Manners-Sutton, the younger sons of his daughter Bridget and her husband John Manners, 3rd Duke of Rutland.