St Martin-in-the-Fields is a Church of England parish church at the north-east corner of Trafalgar Square in the City of Westminster, London. Dedicated to Saint Martin of Tours, there has been a church on the site since at least the medieval period. This location, at that time, was farmlands and fields beyond the London wall.

Trafalgar Square is a public square in the City of Westminster, Central London, established in the early 19th century around the area formerly known as Charing Cross. The square's name commemorates the Battle of Trafalgar, the British naval victory in the Napoleonic Wars over France and Spain that took place on 21st October 1805 off the coast of Cape Trafalgar.