An unidentified motorcyclist holds a wheelie over the entire Auckland harbour bridge.

A motorcyclist has been filmed performing a wheelie along much of the length of Auckland Harbour Bridge.

Police have condemned the unidentified rider's actions, saying it could have had fatal consequences.

The footage was posted to Instagram on Saturday morning, with the caption: "World first! Harley Davidson wheelies entire Auckland Harbour Bridge!!"

Supplied The identity of the daredevil motorcyclist remains a mystery.

The identity of the motorcyclist remains a mystery.

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Police said they were investigating the incident.

"The behaviour of this motorcyclist is extremely dangerous and could potentially have fatal consequences," a spokesperson said.

"It shows a complete lack of regard for their own safety and the safety of others.



"We urge anyone who witnesses this type of behaviour to contact police."

The NZ Transport Agency said it was passing footage from its traffic cameras of the incident on to police.

Auckland transport operations manager Rua Pani said that as the operator of the Harbour Bridge, the agency "condemns this sort of behaviour".

"It poses a huge safety risk for the motorcyclist and all other road users," Pani said.

"It is reckless and dangerous and we'll support the police in any way to identify the person or persons involved."