Gainsborough (1915–1945) was a British bred Thoroughbred racehorse who won the English Triple Crown in 1918 and became a superior sire.

[1] Lady Douglas sent Gainsborough to trainer Alec Taylor, Jr.'s training centre in Manton, Wiltshire, to prepare for racing.

As a two-year-old, Gainsborough made three starts at the Newmarket Racecourse, won the Autumn Stakes by two lengths,[2] and was rated the third best juvenile of his generation.

Following his win in the 2,000 Guineas, Gainsborough won the most prestigious race in England, The Derby, which was run at Newmarket owing to wartime restrictions.

[3] In 1920, Gainsborough was retired to Lady Douglas's newly established Harwood Stud horse breeding operation in northern Hampshire at Woolton Hill, near Newbury, Berkshire.