Coordinates: 51°31′28″N 0°7′7″W / 51.52444°N 0.11861°W
Mecklenburgh Square is a Grade II listed square located in the King's Cross area of central London. The Square and its garden were part of the Foundling Estate, a residential development of 1792–1825 on fields surrounding and owned by the Foundling Hospital. The Square was named in honour of King George III’s Queen, Charlotte of Mecklenburg-Strelitz. It was begun in 1804, but was not completed until 1825.
It is notable for the number of historic terraced houses that face directly onto the square and the Mecklenburgh Square Garden. Access to the garden is only permitted to resident keyholders, except when it is open to all visitors for Open Garden Squares Weekend.
The garden was laid out and planted between 1809 and 1810 as the centrepiece of the newly developed Mecklenburgh Square; buildings on the eastern side were designed by architect Joseph Kay. The 2 acres (8,100 m2) garden is made up of formal lawns, gravel paths, mature plane trees and other ornamental trees. It contains a children's playground, and a tennis court. The east side of the garden is planted with plants native to New Zealand.