St. Mary's Catholic Junior School is a primary school based in Croydon under the Croydon local authority.

The school educates mixed pupils aged 7 to 11. It currently has 231 pupils on roll with space for 240, offering a broad curriculum across all primary year groups.

The most recent Ofsted inspection, published on 12 September 2023, rated the school Outstanding. Inspectors highlighted the overall quality of education and the strong relationships between staff and pupils.