Two elderly women, one in Thames and another in Waihī, each lost $46,000, while an elderly couple in Whitianga lost $25,000 to online scammers.
One of the victims was asked to download a "remote access application" onto their computers, allowing the scammers complete and uninterrupted access to all the victim's banking and personal details.
Detective Sergeant Mark Leathem said in each of these cases, offenders initially telephoned the victims and convinced them they were a member of a bank fraud team needing assistance to catch a bank staff member suspected of wrongdoing.
The offenders convinced the victims to transfer money into Australian-based bank accounts.
"These scammers, who we believe are linked, appear to be targeting the elderly and more- vulnerable members of our communities and are preying on their good morals, making them believe they are assisting trustworthy organisations with their investigations," says Detective Sergeant Leathem.