Kensington Preparatory School is a private day school for girls aged 4–11 in Fulham, London, England.

It opened in January 1873 at Smith Street in Chelsea with 20 girls under headmistress Miss Porter.

The original Chelsea High School continued functioning until 1894.

The school was relocated to Phillimore Gardens as a temporary measure for the duration of World War II while the management searched for a better location.

[3] In the end, the senior school was closed several years after the War ended while the junior school remained open and became Kensington Prep.