Barnwell may refer to:
- Barnwell, Alberta, Canada
- Barnwell, California, USA
- Barnwell, Cambridgeshire, a suburb in north-east Cambridge, England
- Barnwell, Northamptonshire, England
- Barnwell, South Carolina, USA
- Barnwell chronicler, the writer of thirteenth-century Latin chronicle named after the priory at Barnwell near Cambridge
- Barnwell School, Stevenage, England
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