Jocelyn Edward Salis Simon, Baron Simon of Glaisdale, PC, DL (15 January 1911 – 7 May 2006) was a Law Lord in the United Kingdom, having been, by turns, a barrister, a commissioned officer in the British Army, a barrister again, a Conservative Party politician, a government minister, and a judge.

As noted by The Independent in his obituary, "Jack Simon was the last of a breed of judges who first pursued a successful career in politics before promotion to the Bench.

[2] He commanded a special service squadron of three Valentine tanks of the Royal Armoured Corps in the invasion of Madagascar in 1942 and the subsequent six-month campaign to liberate it from Vichy French control.

He was Parliamentary Private Secretary to the Attorney-General, Sir Lionel Heald, for three years, and then held three ministerial positions.

He took charge of the bill that became the Homicide Act 1957, earning the respect of Rab Butler, then Home Secretary.

However, after three years as Solicitor-General, he resigned from his office and his seat in Parliament in 1962, to widespread surprise, to become a High Court judge, and President of the Probate, Divorce and Admiralty Division, replacing Lord Merriman.

The operation left him paralysed on one side of his face: he had a speech impediment and also lost the use of his right eye; he habitually wore a black eye-patch thereafter, which gave him somewhat of a piratical air.

[5] He retired from judicial office in 1977, but continued to attend the House of Lords and took a close interest in legislation.

[6] At the time of his death in 2006, he was the last living person to have held the title of a KC, having been appointed in 1951 under the reign of George VI.