Monday
May 18, 2026
15 holidays and observances fall on this day.
International Museum Day
International Museum Day highlights the importance of museums in cultural exchange, education, and community development worldwide.
National Speech Pathologist Day
National Speech Pathologist Day is observed on May 18 to honor SLPs and their work in communication and swallowing support.
National No Dirty Dishes Day
National No Dirty Dishes Day is observed on May 18 to enjoy meals with less cleanup and a cleaner kitchen sink.
I Love Reese's Day
I Love Reese's Day is observed on May 18 to enjoy Reese’s candy, peanut butter cups, and chocolate-peanut butter treats.
National Visit Your Relatives Day
National Visit Your Relatives Day is observed on May 18 to reconnect with family members and strengthen personal ties.
Mother Whistler Day
Mother Whistler Day is observed on May 18 to enjoy whistling, playful sound, and its odd link to Whistler’s Mother.
National Cheese Soufflé Day
National Cheese Soufflé Day is observed on May 18 to enjoy a savory French-style baked egg and cheese dish.
National HIV Vaccine Awareness Day
National HIV Vaccine Awareness Day is observed on May 18 to recognize HIV vaccine research, volunteers, and prevention education.
Send an Electronic Greeting Card Day
Send an Electronic Greeting Card Day is observed on May 18 to share digital cards, kind notes, and personal messages.
Supply Chain Professionals Day
Supply Chain Professionals Day is celebrated on the third Monday in May to honor logistics and supply chain workers.
Victoria Day in Canada
Victoria Day in Canada is observed on the Monday before May 25 to honor Queen Victoria and the Sovereign’s birthday.
Haitian Flag Day
Haitian Flag Day is observed on May 18 to honor Haiti’s flag, independence, unity, and national identity.
National Patriots’ Day in Quebec
National Patriots’ Day in Quebec is observed on the Monday before May 25 to commemorate the Patriotes and democratic struggles.
National Marshmallow Day in Australia
National Marshmallow Day in Australia is observed on May 18 to enjoy marshmallows, desserts, hot drinks, and sweet treats.
State Flag of Turkmenistan Day
State Flag of Turkmenistan Day is observed on May 18 to honor Turkmenistan’s flag, Constitution, and national identity.
Coming up next
Dinosaur Day
Celebrate Dinosaur Day on the third Tuesday of May by exploring the prehistoric world of dinosaurs through fun, educational activities for all ages.
World Family Doctor Day
World Family Doctor Day honors the essential role of family physicians in providing comprehensive and continuous care to communities worldwide.
World IBD Day
World IBD Day is observed on May 19 to raise awareness of Crohn’s disease, ulcerative colitis, and IBD care.
Agender Pride Day
Agender Pride Day is observed on May 19 to recognize agender identity, visibility, and respect for pronouns.
World Crohn's and Colitis Day
World Crohn's and Colitis Day is observed on May 19 to raise awareness of Crohn’s disease, colitis, and IBD care.
Plant Something Day
Celebrate Plant Something Day on May 19 by engaging in planting activities that promote environmental sustainability and personal well-being.
Malcolm X Day
Malcolm X Day is observed on May 19 to honor Malcolm X’s life, civil rights work, and human rights legacy.
National Devil's Food Cake Day
National Devil's Food Cake Day is observed on May 19 to enjoy a rich, dark chocolate cake with a moist crumb.