Lord Chancellor (1945–1951)
After a landslide victory in the 1945 election, Labour formed its first majority government. Prime Minister Clement Attlee appointed Jowitt as Lord Chancellor. As soon as he was appointed, Jowitt met with US Supreme Court Justice Robert H. Jackson to resolve outstanding points of contention over the draft London Charter, which would govern the procedures of the Nuremberg Trials. He retained the Conservative MP and outgoing Attorney General, Sir David Maxwell-Fyfe, as the official liaison but indicated that the new Attorney General, Sir Hartley Shawcross, would serve as Britain's chief prosecutor in the trials themselves.
Jowitt introduced and saw signed the United Nations Act 1946, the legislation that governs how the UK subordinates itself to the UN.
He was raised to the peerage as Baron Jowitt, of Stevenage in the County of Hertford, on 2 August 1945 and entered the House of Lords. He led much important judicial legislation during the life of the Labour government.
Jowitt was also responsible for some key changes to the legal culture in Britain. He attempted to end political and social imbalances in the Magistrates Courts and is considered to have been the first Lord Chancellor to adopt a policy of appointing judges purely on the basis of merit.
As Lord Chancellor, he also served as speaker of the House of Lords, a delicate job given the Conservative majority in the Lords. Christopher Addison, Labour's leader in the Lords, died shortly after the party's defeat in the 1951 general election.
Labour was now in opposition, and Jowitt took over as leader of the Labour peers. He was created Viscount Jowitt, of Stevenage in the County of Hertford, on 20 January 1947, and was awarded an earldom by Attlee in the 1951 Prime Minister's Resignation Honours, being created Viscount Stevenage, of Stevenage in the County of Hertford, and Earl Jowitt on 24 January 1952.