Buckingham Palace is located in Central London and is one of London's premier tourist attractions. If you are travelling by car, beware that you will enter the congestion charge zone. It's best to leave your car behind and use public transport. As well as the congestion charge, you will find that car parking in central london is very expensive.
Car parks near to Buckingham Palace include Westminster City Council car park in Victoria Street, and National NCP Car Parks throughout the area including St James's, Horseferry Road and Belgrave Road.