Sightings of the apparition, said to be a woman dressed in all-black period clothing, have been reported four times in as many weeks at Silverburn shopping centre in Glasgow.
Managers have now called in experts from Glasgow Paranormal Investigations to help establish the cause of the sightings.
A Silverburn spokesman said: "We are aware that a shadowy woman has been spotted around the centre and we are taking the sightings extremely seriously.
"We have reached out to local experts in the field of paranormal activity, who will hopefully be able to shed some light on the matter."
The shopping centre opened in 2007, built on the former Pollok shopping centre site.
Last year, the centre opened a further �20 million extension to the building and prior to this there had been no reports of paranormal activity.
A member of Glasgow Paranormal Investigations said: "It is not uncommon for a spirit to be attached to a site before the present building was constructed.
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