St Mary's RC Junior School is a primary school based in Carshalton under the Sutton local authority.

The school educates mixed pupils aged 7 to 11. It currently has 362 pupils on roll with space for 360, offering a broad curriculum across all primary year groups.

Ofsted last inspected the school on 4 February 2020, awarding it a Outstanding rating. The report noted positive aspects of leadership, safeguarding and the school’s approach to pupil development.