Vice-Admiral Sir Peter Warren, KB was an Anglo-Irish naval officer and politician who sat in the British House of Commons representing the constituency of Westminster from 1747 to 1752. Warren is best known for his career in the Royal Navy, which he served in for thirty-six years and participated in numerous naval engagements, including most notably the capture of the French fortress of Louisbourg in 1745.

Westminster was a parliamentary constituency in the Parliament of England to 1707, the Parliament of Great Britain 1707–1800 and the Parliament of the United Kingdom from 1801. It returned two members to 1885 and one thereafter.