Gilbert Heathcote-Drummond-Willoughby, 2nd Earl of Ancaster GCVO JP DL (29 July 1867 – 19 September 1951), known as Lord Willoughby de Eresby from 1892 to 1910, was a British Conservative politician.

Ancaster later held office as Parliamentary Secretary to the Ministry of Agriculture and Fisheries under David Lloyd George from 1921 to 1922 and under Bonar Law and Stanley Baldwin from 1922 to 1924.

[1] Apart from his parliamentary political career he was also Lord Lieutenant of Rutland from 1921 to 1951, Chairman of Rutland County Council from 1922 to 1937, DL for the county of Perthshire and JP for Lincolnshire, where he was Chairman of the Kesteven Quarter Sessions from 1911 to 1937.

[4] On 12 December 1902 he was one of the founding directors of Ivel Agricultural Motors Limited of Biggleswade, founded by Dan Albone who had invented the Ivel Agricultural Motor (the word 'tractor' did not come into common use until later).

Lord Alastair's brother, Henry Innes-Ker, 8th Duke of Roxburghe, also married an American, Mary Goelet.