The defibrillator’s glass casing was smashed, while there was also damage to the nearby public toilets at the bus station.
The incidents happened on January 11 and it is understood the police have spoken to those involved.
Wooler Parish Council chairman Mark Mather, who is also a community first responder, revealed he had spoken about the incident to local pupils.
“Hopefully with a bit more work in the schools they will learn the importance of the defibrillator,” he said.
Damage to a sign at Bryson’s Park was also reported at the parish meeting.
In the monthly police report, it was revealed that inquiries are continuing into a burglary on South Road.
Investigations into the theft of alcohol from the Co-op are also being made. CCTV images have been circulated but the offender has not yet been identified.