75 single people in Ireland were scammed out of more than one million euro least year.
Gardai are reminding those looking for love to be aware of "romance fraud" on dating sites and apps.
During 2019, Gardai investigated 75 cases where fraudsters developed an online relationship with a victim.
In total, those 75 people were scammed out of more than €1,000,000.
Criminals pose as single people looking for love online, often using fake photos and details to start a chat.
Once the conversation goes well, they eventually ask their potential date for money.
Often they explain they need it for an emergency, or to cover the cost of travel to meet up.
The fraudster will then cancel the planned date, and make up reasons for never being able to meet face to face.
In one case last year, an Irish woman developed an online relationship with a man who tricked her into sending him €62,000.
Gardai are advising people who use online dating sites and apps to never share personal information or bank details.
Anyone who suspects a fraudster is operating online is asked to report it in confidence to their local garda station.