Across the U.S., donut distributors – large and small – also participate in National Donut Day; big names Dunkin' and Krispy Kreme, which officially call them "doughnuts," will be giving away free donuts on June 6.

Krispy Kreme is celebrating National Doughnut Day with $2 dozens of its Original Glazed Doughnuts and a sweet freebie for all customers. On June 6, all guests can purchase the retailer’s Original Glazed dozen doughnuts for just $2.

Whether you spell it "doughnut" or "donut," you can enjoy a free treat at various stores on Friday in celebration of National Doughnut Day.