1750 Westminster by-election

The 1750 Westminster by-election was a ministerial by-election to the Parliament of Great Britain for the Westminster constituency which took place between November 1749 and May 1750. The final result was declared on 15 May 1750, with the incumbent, Viscount Trentham, retaining his seat.

The by-election was notable for being highly contentious, even by the standards of 18th-century British elections. This materialised in the involvement of George II, Frederick, Prince of Wales and Jacobite agents, an intense Paper War between supporters of the candidates, mob violence, and the arrest of an election agent, Alexander Murray of Elibank. It was also the first British election in which a black person, John London, is recorded to have voted.