Charles Spencer, 3rd Earl of Sunderland, KG, PC, known as Lord Spencer from 1688 to 1702, was an English statesman and nobleman from the Spencer family. He served as Lord Lieutenant of Ireland (1714–1717), Lord Privy Seal (1715–1716), Lord President of the Council (1718–1719) and First Lord of the Treasury (1718–1721).

The Lord Privy Seal is the fifth of the Great Officers of State in the United Kingdom, ranking beneath the Lord President of the Council and above the Lord Great Chamberlain. Originally, its holder was responsible for the monarch's personal (privy) seal until the use of such a seal became obsolete. Though one of the oldest offices in European governments, it has no particular function today because the use of a privy seal has been obsolete for centuries; it may be regarded as a traditional sinecure, but today, the holder of the office is invariably given a seat in the Cabinet of the United Kingdom, and is sometimes referred to as a minister without portfolio.