The man was believed to be in his forties.
He was seated in the upper tier of the stadium, reportedly around 170 feet above the ground.
Paramedics offered immediate assistance, but the man was declared dead at the scene with “injuries consistent with a fall.”
Police are calling for witnesses or anyone who may have inadvertently filmed the accident to come forward.
In a statement, Oasis said: “We are shocked and saddened to hear of the tragic death of a fan at the show last night. Oasis would like to extend our sincere condolences to the family and friends of the person involved.”
The band’s Live ’25 reunion tour will continue through Scotland and Ireland, before heading to Canada and the US in late August.