Lotto NZ head of communications and corporate social responsibility Marie Winfield said the company had seen an increase in customers reporting scams over the past few months.
"This has included customers telling us that they have received text messages from parties posing as Lotto NZ, saying they want to get in contact with them.
"We recommend that people stay vigilant when it comes to scams, especially at this time of year when people may be more vulnerable to scammers."
Lotto does send text messages to certain customers who've subscribed for the "text to play" service which are sent from the number 3361, Winfield said.
"It is particularly prevalent at this time of year as more people are shopping online and expecting a package so potentially more likely to fall for it."
Anyone who receives a fake message should delete the message immediately and not click on any links.