John Ball Primary School is a state primary school in Blackheath in the borough of Lewisham, London, England. It is named after the 14th century Lollard priest, John Ball, who preached to participants in the Peasants' Revolt on Blackheath. The school has approximately 550 pupils aged 3–11 on its roll. The main building was opened in 1953, and a purpose-built Early Years Unit was added in early 2001. In 2010 a new Music block was opened, and a new Year 6 block opened in 2011.