Colonel William Cornwallis Cornwallis-West, VD, JP, DL (20 March 1835 – 4 July 1917) was a British landowner, politician for seven years from 1885 and raised the 6th (Ruthin) Denbighshire Rifle Volunteer Corps followed by further ceremonial duties in the wider territorial army in Wales.

He was the son of Frederick Richard West, a Tory MP for Denbigh Boroughs and East Grinstead who was a member of the Canterbury Association, and his wife, Theresa Cornwallis Whitby.

His maternal grandparents were both Royal Navy figures: Captain John Whitby and Mary Anne Theresa Symonds (adoptive daughter and heiress of Admiral William Cornwallis).

His widow died in July 1920, shortly after returning from Monaco, at her family's Arnewood House which has a half-wooded holding 1.2 miles (1.9 km) north of her other mansion: Newlands, near Milford-on-Sea in Hampshire.

George, who had already been declared bankrupt, after the sale of certain lots, decided to dispose of the bulk – the rest – of the Hampshire estate so astutely acquired by his great-grandmother.

The house, which had been badly neglected, and 500 acres was bought by Sir John Power, MP for Wimbledon, who made improvements but put it up for sale in 1948.