International Mountain Day
International Mountain Day raises awareness about the importance of mountains to life, highlighting their role in water supply and biodiversity.
Friday
What holiday is on December 11?
10 holidays and observances fall on December 11.
International Tango Day
International Tango Day is observed on December 11 to honor the birthdays of tango legends Carlos Gardel and Julio de Caro.
UNICEF Birthday
UNICEF Birthday is observed on December 11 to celebrate the 1946 founding of the United Nations Children's Fund.
Mountain Day
International Mountain Day on December 11 raises awareness about mountains' crucial role in water, food, and biodiversity. Learn how to observe this UN
National Salesperson Day
National Salesperson Day (the Second Friday in December) is dedicated to recognizing the hard work and dedication of salespeople everywhere.
Noodle Ring Day
Noodle Ring Day is observed on December 11 to celebrate the vintage tradition of baking pasta in a ring mold.
National App Day
National App Day is observed on December 11 to celebrate the innovation of mobile applications and the developers who create them.
Lost and Found Day
Lost and Found Day is observed to encourage the recovery of misplaced items and the donation of unclaimed goods.
Holiday Food Drive for the Needy Animals Day
Holiday Food Drive for the Needy Animals Day is observed on December 11 to collect food and supplies for shelters and pets in need.
Burkina Faso Republic Day
Burkina Faso Republic Day is observed on December 11 to commemorate the 1958 proclamation of the autonomous republic.
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International Shareware Day
International Shareware Day is a day to acknowledge the hard work of programmers who create software that users can try before buying.
Retail Employees Day
Retail Employees Day is observed on December 12 to thank and celebrate the hard work of retail staff worldwide.
Festival of Unmentionable Thoughts
The Festival of Unmentionable Thoughts is observed to encourage self-reflection and the acknowledgment of private, often unspoken ideas.
International Sound Check Day
International Sound Check Day is celebrated on December 12 to honor audio engineers and the "one, two" microphone test ritual.
International Universal Health Coverage Day
International Universal Health Coverage Day is observed on December 12 to advocate for accessible and affordable medical care for all.
International Day of Neutrality
International Day of Neutrality is observed on December 12 to promote the role of neutral states in maintaining global peace and security.
National Poinsettia Day
National Poinsettia Day is observed on December 12 to honor Joel Roberts Poinsett and celebrate the world's most popular holiday plant.
National Ding-A-Ling Day
National Ding-A-Ling Day is observed on December 12 to encourage people to reconnect with old friends and family through phone calls.
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