National Waffle Iron Day is observed in the United States every year on June 29. This holiday celebrates the waffle iron, a kitchen appliance used to cook waffles, which are made from batter or dough cooked between two heated patterned plates. The origins of waffle irons date back to the 14th century in the Low Countries, where they featured elaborate designs that imprinted patterns on the waffles. Waffle makers were introduced to America by Dutch colonists in the 1620s, and an improved design was patented by Cornelius Swartwout in 1869. Modern electric waffle irons became common in American households by the mid-20th century, with many featuring non-stick coatings and removable plates for versatility. To celebrate, people are encouraged to make waffles for breakfast or brunch, share their creations on social media with the hashtag #NationalWaffleIronDay, and host waffle parties where they can experiment with different recipes and toppings.