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 a sweet giveaway. On Friday, June 6, anyone can get a free doughnut of their choice at participating Krispy Kreme shops nationwide, the Charlotte-based doughnut chain said. No purchase is necessary.

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