John Lambton, 1st Earl of Durham, English soldier and politician, Lord Privy Seal (died 1840)

John George Lambton, 1st Earl of Durham,, also known as "Radical Jack" and commonly referred to in Canadian history texts as Lord Durham, was a British Whig statesman, colonial administrator, Governor General and high commissioner of British North America.

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.