The Royal Masonic School for Girls (RMS) is a private school in Rickmansworth, Hertfordshire, England, with day and boarding pupils. The school was instituted in 1788, with the aim of caring for the daughters of poor Freemasons. In 1978, the school opened to girls beyond the daughters of freemasons.

Rickmansworth, a town in south-west Hertfordshire, England, is located approximatly 17 miles (27 km) north-west of central London, 5 miles (8 km) south-west of Watford and inside the perimeter of the M25 motorway. The town is mainly to the north of the Grand Union Canal and the River Colne.