John Allsebrook Simon, 1st Viscount Simon of Stackpole Elidor (1873-1954) was a British politician and statesman. Called to the bar in 1899, Simon became a successful lawyer, and entered parliament as a Liberal in 1906. He entered the Government as Solicitor-General in 1910, and advanced in 1913 to Attorney-General, in both cases succeeding Rufus Isaacs. In Asquith's coalition government in May 1915, Simon became Home Secretary, but resigned early the next year in protest against the introduction of conscription.

After Asquith's fall in late 1916, Simon remained in opposition as an Asquithite Liberal until 1918, and once again after 1922. In 1931, when the Liberals split once again, Simon became leader of the National Liberals who supported protectionism and Ramsay MacDonald's Coalition government, and served as Foreign Secretary under MacDonald, and then as Home Secretary under Baldwin and Chancellor of the Exchequer under Chamberlain. Over this time, Simon's National Liberals became hardly distinguishable from the Conservatives. In 1940, Simon was raised to the peerage as Viscount Simon of Stackpole Elidor, and became Lord Chancellor in Churchill's government, although he did not sit in the War Cabinet. In 1945 Churchill formed a brief peacetime administration but once again excluded Simon from the Cabinet - an unprecedented move in peacetime. With Churchill's defeat in 1945, Simon retired from public life.