articleThe Brief National Donut Day is Friday, June 6. 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. National doughnut deals/freebiesAnyone looking for a pick-me-up this Friday can take advantage of these Donut Day deals while supplies last. The backstory:National Donut Day was established in Chicago in 1938 to honor the Salvation Army's "Donut Lassies."