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 was educated at Gresham's School, in Holt, Norfolk and read English at Trinity Hall, Cambridge.

[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.

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.