Robert Cecil, 1st Viscount Cecil of Chelwood, English lawyer and politician, Under-Secretary of State for Foreign Affairs, Nobel Prize laureate (died 1958)

Edgar Algernon Robert Gascoyne-Cecil, 1st Viscount Cecil of Chelwood,, known as Lord Robert Cecil from 1868 to 1923, was a British lawyer, politician and diplomat. He was one of the architects of the League of Nations and a defender of it, whose service to the organisation saw him awarded the Nobel Peace Prize in 1937.

The parliamentary under-secretary of state for foreign affairs was a junior position in the British government, subordinate to both the secretary of state for foreign affairs and since 1945 also to the minister of state for foreign affairs. The post is based at the Foreign, Commonwealth and Development Office, which was created by the merger of the Foreign Office, where the position was initially based, with the Commonwealth Office in 1968 and the Department for International Development in 2020. Notable holders of the office include Granville Leveson-Gower, 2nd Earl Granville, John Wodehouse, 1st Earl of Kimberley, Edward Grey, 1st Viscount Grey of Fallodon, George Curzon, 1st Marquess Curzon of Kedleston, and Anthony Eden.

The Nobel Peace Prize is one of the five Nobel Prizes established by the will of Swedish industrialist, inventor, and armaments manufacturer Alfred Nobel, along with the prizes in Chemistry, Physics, Physiology or Medicine, and Literature. Since March 1901, it has been awarded annually to people who have "done the most or the best work for fraternity between nations, for the abolition or reduction of standing armies and for the holding and promotion of peace congresses." The Oxford Dictionary of Contemporary History describes it as "the most prestigious prize in the world."