National Donut Day is the first Friday in June, which falls on June 6 this year. Many doughnut spots are offering a free treat today.

National Donut Day also celebrates the Salvation Army "Lassies," or women who served doughnuts to soldiers during WWI. National Donut Day is on Friday, June 6, and several chains are offering deals for the annual unofficial food holiday.

All guests this Friday can receive a dozen Original Glazed doughnuts for just $2 with the purchase of any dozen at regular price in shop and via drive-thru at participating Krispy Kreme shops. Also on Friday, guests can receive any doughnut of choice for free – no purchase necessary.