Major Gilbert George Reginald Sackville, 8th Earl De La Warr JP, DL, styled The Honourable Gilbert Sackville until 1890 and Viscount Cantelupe between 1890 and 1896, was a British landowner, politician and soldier.

Earl De La Warr is a title in the Peerage of Great Britain. It was created in 1761 for John West, 7th Baron De La Warr. The Earl holds the subsidiary titles of Viscount Cantelupe (1761) in the Peerage of Great Britain, Baron De La Warr (1572) in the Peerage of England, and Baron Buckhurst, of Buckhurst in the County of Sussex (1864) in the Peerage of the United Kingdom. The barony De La Warr is of the second creation; however, it bears the precedence of the first creation, 1299, and has done so since shortly after the death of William West, 1st Baron De La Warr. The family seat is Buckhurst Park, near Withyham, Sussex.