Gerald William Balfour, 2nd Earl of Balfour, PC, known as Gerald Balfour or The Rt Hon. G. W. Balfour until 1930, was a senior British Conservative politician who became a peer on the death of his brother, former prime minister Arthur Balfour, in 1930.

Arthur James Balfour, 1st Earl of Balfour,, also known as Lord Balfour, was a British statesman and Conservative politician who served as Prime Minister of the United Kingdom from 1902 to 1905. As foreign secretary in the Lloyd George ministry, he issued the Balfour Declaration of 1917 on behalf of the cabinet, which supported a "home for the Jewish people" in Palestine.