John Mason School (JMS) is a secondary school with sixth form in the town of Abingdon-on-Thames, Oxfordshire. Named after English diplomat and spy Sir John Mason, the school opened in September 1960. It shares its sixth from, JMF6 Abingdon, with Fitzharrys School, another secondary school in Abingdon. As of November 2025, the school has an enrollment of 859 students in Years 7–11, and 133 students in its sixth form as of December 2024.
- Country
- United Kingdom
- Inception
- September 1960, February 1, 2014
- Website
- https://johnmason.oxon.sch.uk
