Elizabeth Fuller (1644–1709) founded a Free School for boys and girls in Watford, Hertfordshire, England.

In 1704 she built a new Free School for forty boys and twenty girls on her land next to the churchyard, with rooms for the Master and man, and in 18 she endowed it with £2 a year.

Elizabeth Fuller is remembered every year in the present schools' Founder's Day services.

Every year we hold a Founder's Day service to commemorate the charitable foundation of Watford Grammar School for Boys.

With the help of endowments and occasional gifts, Elizabeth Fuller's original charity school survived until the 1880s.