Donut Day falls on the first Friday of June each year.
Dunkin' is celebrating by giving out a free donut with any beverage purchase.
They have also released a line of National Donut Day merchandise including clothing and totes available here.
Krispy Kreme is offering every customer a free doughnut of their choice. It's limited to one per person and only valid in-shop and drive-thru, not for online orders. In addition to National Doughnut Day, guests who have received a COVID vaccination shot are still eligible for one free Original Glazed doughnut.
Duck Donuts is offering a free bare, cinnamon sugar or powdered sugar donut at their stores. No purchase necessary.
DiGiorno, the frozen pizza company, is also getting into the Donut Day fun. They are holding a sweepstakes where you can win a DiiGiornut - a pizza-donut mashup. To enter, you reply to their tweet with #Sweepstakes. The full rules are here.
RELATED: History of National Doughnut Day
National Donut Day facts