Several tourists are thought to have witnessed the horror around 3pm on Sunday, which saw the young boy plunge more than 50 feet.
He was rushed from the scene in a critical condition, before tragically dying in hospital in Alicante late on Sunday night.
The hotel, in the popular tourist town of Alfaz del Pi near Benidorm, has not yet been named.
A spokesman for Spain’s Civil Guard said: “We are investigating but everything is pointing to the tragedy being the result of negligence on the part of the youngster who died.
“He wasn’t staying at the hotel in Alfaz del Pi where it happened and got onto the roof of the building with another friend to practise parkour.
“In an accident he appears to have fallen about 52 feet, landing in the reception hall on the ground floor.
“He was taken to hospital in a very severe state, first Marina Baixa Hospital in Villajoyosa and then Alicante General University Hospital, where he died on Sunday night around 11.30pm.
“The dead child is a Norwegian boy aged 11 who lived in Alfaz del Pi.
“That is the only information we have at the moment.”
Officers have declined to name the hotel. Sources said there were a number of people believed to be tourists in the reception area when the first police arrived.
One said: “Emergency responders started getting calls almost immediately after the boy fell.”
Parkour is a sport in which practitioners attempt to get from point A to point B in the fastest and most efficient way possible, often while performing artistic-gymnastic manoeuvres.
In August, a teenager fell to his death from the roof of a 17-storey building in Hong Kong while practising parkour with two friends.