Police were called to the Isle of Wight Festival following a death at the campsite yesterday morning (Thursday).
Police were called at 10.51am to a report of a sudden death.
A woman in her 40s has been confirmed as deceased and her family are aware.
This is not being treated as suspicious and a file will be prepared for the coroner.
An official statement from the Festival said:
"The team at the Isle of Wight Festival are deeply saddened by the passing of a festivalgoer on Thursday morning.
"Our thoughts and deepest condolences are with her family and friends."