The best way to access the Royal Institution is by public transport.
The closest tube station to the Royal Institution is Green Park on the Jubilee, Victoria and Piccadilly lines. The Royal Institution is a five minute walk from the station. Also within a ten minute walking distance is Piccadilly Circus tube station, on the Piccadilly and Bakerloo lines, or Oxford Circus tube station on the Victoria, Central and Bakerloo lines.
There are numerous bus stops along Piccadilly which runs along the entrance to Albemarle Street. Bus numbers: 9, 14, 19, 22 and 38.