Trafalgar Square is a public square located in the heart of London, United Kingdom. The square was built in the 1820s and named in commemoration of the British naval victory at the Battle of Trafalgar, which occurred in 1805.

At the center of the square stands the iconic Nelson's Column, a monument erected in honor of Admiral Horatio Nelson, who led the British fleet to victory at Trafalgar. The column stands 169 feet tall and is topped with a statue of Nelson.

Surrounding the square are several notable buildings, including the National Gallery, which houses one of the world's most extensive collections of Western European paintings. Other nearby attractions include St. Martin-in-the-Fields church, which is known for its Baroque architecture and classical music concerts, and the Canadian High Commission, which is housed in a historic building known as Canada House.

Trafalgar Square is also known for its public events and celebrations, such as New Year's Eve fireworks displays and outdoor concerts. The square is a popular destination for both tourists and locals alike, and its central location makes it easily accessible by public transportation.