Lieutenant-General Owen Lewis Cope Williams JP (13 July 1836 – 2 October 1904) was a British Army officer and Conservative politician who sat in the House of Commons from 1880 to 1885.

Three generations of descent from Thomas Williams of Llanidan, who had made a fortune from the copper of Mynydd Parys.

[25] For the purposes of the royal suite for this journey, he had the title of equerry, with the courtiers Arthur Ellis and Dighton Probyn.

[27] He was sent on a side trip from Bombay to Hyderabad state, in November 1875, in response to an invitation from its Prime Minister Salar Jung I, with Charles Harbord, 5th Baron Suffield and Francis Knollys.

[29] At the beginning of 1876 a potentially damaging scandal blew up, involving Williams's sister Edith, married to Heneage Finch, 7th Earl of Aylesford: who was in India with the Prince's party.

She wrote to her husband in February of that year from Packington Hall, announcing her intention to run off with George Spencer-Churchill, Marquess of Blandford.

George's brother Lord Randolph Churchill at the same time wrote to involve the Prince, whom he asked to moderate the reactions of Aylesford and Williams.

Williams wrote to Charles Yorke, 5th Earl of Hardwicke, who was acting for the Prince in dealing with Randolph, suggesting Aylesford should challenge Blandford to a duel (by then illegal).

In 1885, the founding with the backing of Leopold de Rothschild of the Eclipse Stakes, offering prize money of £10,000, saw the Williams brothers and their partner Wilford Brett make the reputation of the Sandown Park racecourse.

[38][39] He was well known at Cowes Week regatta, and celebrated for the occasion when in a gale he told his skipper "We will not shorten sail", resulting in considerable damage.

[42] His major role in the affair was, with Lord Coventry, to defend the reputation of the Prince of Wales by closing down the allegations, and to that end requiring Gordon-Cumming to pledge that he would not again play cards.