Thomas Barnes Cochrane, 11th Earl of Dundonald (14 April 1814 – 15 January 1885) was a Scottish nobleman. He was son of the radical politician and sailor Thomas Cochrane, 10th Earl of Dundonald. As a child he accompanied his father to Chile as a stowaway on the Chilean frigate O'Higgins (1816). In February 1819 the O'Higgins attempted to raid the city of Callao, but was repelled by the coastal fortresses. Thomas Cochrane 11th was almost hit by a cannonball, which instead killed a sailor next to him.