Prime Minister Jacinda Ardern has rejected a $5 bribe from an 11-year-old who wanted the Government to investigate dragons and psychics.

A letter from Ardern - dated April 30, written on official ministerial letterhead and posted to the New Zealand section of web forum Reddit by user honeybee6992 - thanked 'Victoria' for getting in touch.

"We were very interested to hear your suggestions about psychics and dragons, but unfortunately we are not currently doing any work in either of these areas," Ardern told her.

"I am therefore returning your bribe money, and I wish you all the very best in your quest for telekinesis, telepathy and dragons."