Over €1 million euro was stolen in "romance fraud" last year.
Romance fraud is when victims develop online relationships with con artists, who use fake ID, photos and life stories.
The fraudster asks their victim for money and continues to do so until they've no more money or realise they are being conned.
Gardaí say they've investigated 75 cases of the scam last year, where both men and women suffered losses of over €1,000,000.
The public is being asked to watch out for warning signs, such as the person asking to communicate by instant messaging or phone calls and asking for money for things like travel, moving expenses or medical bills.
The fraudster will give reasons for never meeting in person or cancel planned dates.
In one case a woman here developed a relationship with a man online who gained her trust and she sent him €62,000.