Not to be outshined by the McDonald’s Free Chicken Sandwich offer Dunkin Donuts is offering a free iced coffee today from from 10 a.m.-10 p.m. Thursday 15th. Check out the free Dunkin Donuts Free Iced Coffee offer. This is Dunkin’ Donuts second, nationwide Free Iced Coffee Day. In addition to the free coffee Dunkin Donuts will be donating $80,000 to the National Police Athletic League.