The celebration goes back to the 1930s and falls on the first friday of June every year.
Doughnut retailers nationwide are offering free goodies.
Krispy Kreme and LaMar's Donuts each offer a free donut to all customers that come in on Friday, no purchase necessary.
At Dunkin Donuts, the doughnuts are free with the purchase of a beverage. The day also coincides with Dunkin Donuts' launch of the new glazed-donut breakfast sandwich.
Tim Horton's will do the same with a printout of a Facebook coupon.
For more information, visit Donut Day USA here.
Related UPI Stories
National Doughnut Day is not a federal holiday, but it may be a holiday for your bikini-season diet.
© 2013 United Press International, Inc. All Rights Reserved. Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.