National Butter Day is observed worldwide every November 17 and celebrates the significance of butter in culinary traditions. Established in 2021 by Dinner Bell Creamery, a cooperative of family-owned dairy farms, the holiday honors the long history of butter-making, particularly in the American Midwest. It is believed that butter was discovered accidentally by a Persian herder around 9,000 years ago, and it became more widely accepted in Europe by the 12th century. In the United States, butter's popularity grew after the American Revolution, with the first butter factories opening in the 1860s. On this day, people are encouraged to try new butter-based recipes, support local dairy farmers, and participate in events organized by Dinner Bell Creamery. The celebration coincides with the holiday cooking season, making butter a key ingredient in many festive dishes. Participants often share their favorite recipes on social media using the hashtag #NationalButterDay.