Ranger's House is a medium-sized red brick Georgian mansion in the Palladian style, adjacent to Greenwich Park in the south east of London. It is situated in Blackheath and backs directly onto Greenwich Park. Previously known as Chesterfield House, its current name is associated with the Ranger of Greenwich Park, a royal appointment; the house was the Ranger's official residence for most of the 19th century. It is a Grade I listed building. There is a rose garden behind it, and since 2002 it has housed the Wernher Collection of art.

Greenwich Park is a former hunting park in Greenwich and one of the largest single green spaces in south-east London. One of the Royal Parks of London, and the first to be enclosed, it covers 74 hectares, and is part of the Greenwich World Heritage Site. Surrounding the hilltop Royal Observatory and straddling the Greenwich Prime Meridian, it commands elevated views over the River Thames, the Isle of Dogs and the City of London.