All holidays for the month of December in alphabetical order.
- Bifocals at the Monitor Liberation Day – December 1
- A’Phabet Day or No “L” Day – December 25
- Abigail Day – December 27
- Advent Begins – December 3
- Anne and Samantha Day – December 21
- Anniversary of Benazir Bhutto’s Death – December 27
- Anniversary of the Statute of Westminster – December 11
- Answer The Telephone Like Buddy The Elf Day – December 18
- Arabic Language Day – December 18
- Asom Divas – December 2
- Bahrain National Day – December 16
- Bake Cookies Day – December 18
- Bangladesh Victory Day – December 16
- Barbie And Barney Backlash Day – December 16
- Bartender Appreciation Day – December 2
- Bathtub Party Day – December 5
- Bhutan National Day – December 17
- Bill of Rights Day – December 15
- Birthday of Emperor Akihito – December 23
- Blue Christmas Service – December 21
- Bodhi Day – December 8
- Boxing Day – December 26
- Burkina Faso Republic Day – December 11
- Business of Popping Corn Day – December 2
- Cabernet Franc Day – December 4
- Candle Day – December 3
- Card Playing Day – December 28
- Case Day – December 27
- Cat Herders Day – December 15
- Cathode-Ray Tube Day – December 20
- Central African Republic Republic Day – December 1
- Chester Greenwood (Earmuff) Day – December 4
- Choral Day – December 12
- Christmas – December 25
- Christmas Bird Count Week – December 14
- Christmas Card Day – December 9
- Christmas Eve – December 24
- Christmas Jumper Day – December 8
- Coats and Toys for Kids Day – December 3
- Commemoration Day – December 1
- Computer Science Education Week – December 6
- Constitution Day in Thailand – December 12
- Constitution Day of Uzbekistan – December 8
- Constitution of Ireland – December 29
- Crate Day – December 3
- Crohn’s and Colitis Awareness Week – December 1
- Day of Goodwill – December 26
- Day of Navarre – December 3
- Day of Reconciliation – December 16
- Day of the Virgin of Guadalupe – December 12
- Day Without Art Day – December 1
- – Decemberember Solstice – December 21
- Dewey – Decemberimal System Day – December 10
- Día de la Constitución – December 6
- Discovery Day (Haiti) – December 5
- Don’t Make Your Bed Day – December 21
- Dongzhi – December 21
- Dot Your I’s Day – December 20
- Eat a Red Apple Day – December 1
- Extraordinary Work Team Recognition Day – December 4
- Falling Needles Family Fest Day – December 30
- Falls Festival History – December 29
- Farmer’s Day in Ghana – December 3
- Faux Fur Friday – December 3
- Feast of St. Ambrose – December 7
- Feast of St. Francis Xavier – December 3
- Feast of the Immaculate Conception – December 8
- Festival for the Souls of Dead Whales – December 10
- Festival of Enormous Changes at the Last Minute – December 30
- Festival of Unmentionable Thoughts – December 12
- Festival of Winter Walks – December 17
- Festivus – December 23
- Finland Independence Day – December 6
- First Sunday of Advent – December 3
- Flag Day of India – December 7
- Flake Appreciation Day – December 18
- Forefathers’ Day – December 22
- Foundation of Quito Day – December 6
- Free Shipping Day – December 14
- Freedom and Democracy Day in Chad – December 1
- Games Day – December 20
- Genocide Prevention Day – December 9
- Gift of Sight Month – December 1
- Gingerbread – Decemberorating Day – December 12
- Gingerbread House Day – December 12
- Global Fat Bike Day – December 4
- Go Caroling Day – December 20
- Goa Liberation Day – December 19
- GOAL Mile 2021 – December 25
- Green Monday – December 12
- Guadalupe Day – December 12
- Guru Ghasidas Jayanti – December 18
- Halcyon Days – December 14
- Hanukkah – December 7
- Hogmanay – December 31
- Holiday Food Drive for Needy Animals Day – December 11
- Holy Innocents Day – December 28
- Human Rights Day – December 10
- HumanLight – December 23
- Humbug Day – December 21
- Immaculate Conception Day – December 8
- Inclusive Schools Week – December 5
- Indigenous Faith Day in Arunachal Pradesh – December 1
- International Animal Rights Day – December 10
- International Anti-Corruption Day – December 9
- International Cello Day – December 29
- International Cheetah Day – December 4
- International Civil Aviation Day – December 7
- International Dalek Remembrance Day – December 21
- International Day for the Abolition of Slavery – December 2
- International Day of Banks – December 4
- International Day of Commemoration and Dignity of the Victims of the Crime of Genocide and of the Prevention of this Crime – December 9
- International Day of Epidemic Preparedness – December 27
- International Day of Neutrality – December 12
- International Day of Persons with Disabilities – December 3
- International Day of Veterinary Medicine – December 9
- International Migrants Day – December 18
- International Mountain Day – December 11
- International Ninja Day – December 5
- International Shareware Day – December 10
- International Solidarity Day of Azerbaijanis – December 31
- International Sweater Vestival – December 2
- International Tea Day – December 15
- International Universal Health Coverage Day – December 12
- International Volunteer Day – December 5
- Iraq Victory Day – December 10
- Jamhuri Day – December 12
- Jesus’ Birthday – December 25
- Junkanoo – December 26
- Kazakhstan Independence Day – December 16
- Kazakhstan’s First President’s Day – December 1
- King Bhumibol’s Birthday – December 6
- Kisan Diwas – December 23
- Krampusnacht – December 5
- Kwanzaa – December 26
- Lao National Day – December 2
- Las Posadas – December 16
- Last-Minute Shopper’s Day – December 24
- Let’s Hug Day – December 3
- Libya Independence Day – December 24
- Light up A Life Day – December 5
- Look for an Evergreen Day – December 19
- Look On The Bright Side Day – December 21
- Lost and Found Day – December 9
- Macao SARE Day – December 20
- Make Up Your Mind Day – December 31
- Malta Republic Day – December 13
- Mari Lwyd – December 25
- Martyred Intellectuals Day – December 14
- Mathematics Day – December 22
- Memorial Day in East Timor – December 7
- Mitten Tree Day – December 6
- Mongolia Independence Day – December 29
- Monkey Day – December 14
- Month of Giving – December 1
- Month of Overseas Filipino – December 1
- More Good Today Day – December 14
- Mother’s Day in Panama – December 8
- MS Ireland Christmas Jumper Day – December 9
- Mudd Day – December 20
- National AFL-CIO Day – December 5
- National Alabama Day – December 14
- National Ambrosia Day – December 12
- National Andrea Day – December 31
- National Anytime Hawaiian Day – December 2
- National App Day – December 11
- National Armagnac Day – December 21
- National Ashton Day – December 22
- National Bacon Day – December 30
- National Bartender Day – December 2
- National Betty Day – December 22
- National Blake Day – December 9
- National Blue Collar Day – December 8
- National Blue Jeans Day – December 5
- National Bouillabaisse Day – December 14
- National Brownie Day – December 8
- National Build Joy Day – December 2
- National Caesar Day – December 11
- National Call a Friend Day – December 28
- National Candy Cane Day – December 26
- National Cat Lovers’ Month – December 1
- National Champagne Day – December 31
- National Cheryl Day – December 30
- National Chocolate Candy Day – December 28
- National Chocolate Covered Anything Day – December 16
- National Christmas Lights Day – December 1
- National Christmas Movie Marathon Day – December 23
- National Clayton Day – December 12
- National Cocoa Day – December 13
- National Colby Day – December 25
- National Communicate with your kids days – December 5
- National Consumer Rights Day – December 24
- National Cookie Cutter Day – December 1
- National Cookie Cutter Week – December 1
- National Cookie Day – December 4
- National Cookie Exchange Day – December 22
- National Coquito Day – December 21
- National Corey Day – December 10
- National Cotton Candy Day – December 7
- National Cream Cheese Frosting Day – December 13
- National Crime Junkie Day – December 18
- National Crossword Puzzle Day – December 21
- National Cupcake Day – December 15
- National Date Nut Bread Day – December 22
- National Day of Remembrance and Action on Violence Against Women – December 6
- National Deborah Day – December 18
- National Derek Day – December 10
- National Device Appreciation Day – December 17
- National Devon Day – December 5
- National Dice Day – December 4
- National Ding-A-Ling Day – December 12
- National Dorothy Day – December 3
- National Download Day – December 28
- National Drunk and Drugged Driving Prevention Month – December 1
- National Eggnog Day – December 24
- National Emo Day – December 19
- National Energy Conservation Day – December 14
- National Eva Day – December 25
- National Father’s Day in Thailand – December 5
- National Flashlight Day – December 21
- National Forest Day – December 23
- National Francis Day – December 4
- National French Fried Shrimp Day – December 21
- National Fritters Day – December 2
- National Fruitcake Day – December 27
- National Gazpacho Day – December 6
- National Green Bean Casserole Day – December 3
- National Greg Day – December 20
- National Ha Day – December 29
- National Handwashing Awareness Week – December 5
- National Hard Candy Day – December 19
- National Harley Day – December 3
- National Harry Day – December 19
- National Health Savings Account Day – December 8
- National Heather Day – December 3
- National Heroes and Heroines Day – December 19
- National Heroes Day (Timor-Leste) – December 31
- National Homeless Persons’ Remembrance Day – December 21
- National Homeowners Day – December 26
- National Horse Day – December 13
- National Human Rights Consciousness Week – December 4
- National Ice Cream Day – December 13
- National Illinois Day – December 7
- National Influenza Vaccination Week – December 6
- National Isaac Day – December 3
- National Jeremy Day – December 18
- National Johnny Day – December 5
- National Jon Day – December 11
- National Joshua Day – December 25
- National Joy Day – December 7
- National Judith Day – December 7
- National Katherine Day – December 2
- National Lager Day – December 10
- National Lard Day – December 8
- National Laura Day – December 23
- National Lee Day – December 21
- National Lemon Cupcake Day – December 15
- National Letter Writing Day – December 7
- National Lisa Day – December 3
- National Llama Day – December 9
- National Maine Day – December 21
- National Make a Gift Day – December 3
- National Make Cut-Out Snowflakes Day – December 27
- National Maple Syrup Day – December 17
- National Maple Syrup Day Canada – December 17
- National Martha Day – December 27
- National Microwave Oven Day – December 6
- National Miners Day – December 6
- National Mutt Day – December 2
- National Nicole Day – December 23
- National Oatmeal Muffin Day – December 19
- National Opal Apples Day – December 9
- National Package Protection Day – December 1
- National Pastry Day – December 9
- National Paula Day – December 29
- National Pawnbrokers Day – December 6
- National Pearl Harbor Day of Remembrance – December 7
- National Peppermint Bark Day – December 1
- National Pfeffernusse Day – December 23
- National Poinsettia Day – December 12
- National Pumpkin Pie Day – December 25
- National Regifting Day – December 15
- National Repeal Day – December 5
- National Resolution Planning Day – December 30
- National Rhubarb Vodka Day – December 3
- National Rina Day – December 7
- National Roast Suckling Pig Day – December 18
- National Ronald Day – December 3
- National Roof Over Your Head Day – December 3
- National Roots Day – December 23
- National Salesperson Day – December 8
- National Samuel Day – December 27
- National Sangria Day – December 20
- National Short Film Day – December 28
- National Short Person Day – December 22
- National Simon Day – December 8
- National Skip School Day – December 2
- National Sock Day – December 4
- National Steven Day – December 20
- National Thank You Note Day – December 26
- National Tie Month – December 1
- National Tim Day – December 28
- National Travis Day – December 6
- National Twin Day – December 18
- National Underdog Day – December 16
- National Violin Day – December 13
- National Volunteers Month – December 1
- National Wear Your Pearls Day – December 15
- National Whiners Day – December 26
- National Women Support Women Day – December 1
- National Wreaths Across America Day – December 16
- National Write a Business Plan Month – December 1
- National Youth Day Albania – December 8
- New Year’s Eve – December 31
- No Interruptions Day – December 31
- Nobel Prize Day – December 10
- Noodle Ring Day – December 11
- Older Driver Safety Awareness Week – December 6
- Operation Santa Paws – December 1
- Pa Togan Nengminza Sangma – December 12
- Pepper Pot Day – December 29
- Phileas Fogg Win a Wager Day – December 21
- Pick A Pathologist Pal Day – December 13
- Pledge of Allegiance Day – December 28
- Portugal Independence Day – December 1
- Portugal Restoration of Independence Day – December 1
- Pretend To Be A Time Traveler Day – December 8
- Prisoners for Peace Day – December 1
- Proclamation Day – December 28
- Put on Your Own Shoes Day – December 6
- Qatar National Day – December 18
- Quaid-e-Azam Day – December 25
- Republic Day of Niger – December 18
- Restoration Day in Geneva – December 31
- Rizal Day – December 30
- Roast Chestnuts Day – December 14
- Rockefeller Center Christmas Tree Lighting – December 1
- Romania Independence Day – December 1
- Romania National Day – December 1
- Rosa Parks Day – December 1
- Saba Day in Saba – December 3
- Sacagawea Day – December 20
- Sacher-Torte Day – December 5
- Safe Toys and Gifts Month – December 1
- Safety Razor Day – December 2
- Santa Marian Kamalen Day – December 8
- Santa’s List Day – December 4
- São Tomé Day – December 21
- Saturnalia – December 17
- Short Girl Appreciation Day – December 21
- SKYWARN™ Recognition Day – December 2
- Slovenia Independence Day – December 26
- Sodium Bicarbonate Day – December 30
- Special Education Day – December 2
- Spiritual Literacy Month – December 1
- St John History – December 27
- St Nicholas Day – December 6
- St. Clement of Ohrid – December 8
- St. Lucia National Day – December 13
- St. Nicholas Day – December 6
- St. Stephen’s Day (Ireland) – December 26
- State Inauguration Day in Nagaland – December 1
- Still Need To Do Day – December 29
- Stupid Toy Day – December 16
- Synaxis of the Mother of God – December 26
- Take it in the Ear Day – December 8
- Tanzania Independence Day – December 9
- Techno Day – December 9
- The Nos Galan Road Races – December 1
- Tick Tock Day – December 29
- Tree Dressing Day – December 4
- Tupou I Day (in lieu) – December 4
- U.S. National Guard Birthday – December 13
- UAE National Day – December 2
- Udhauli Parva – December 8
- Ugly Sweater Day – December 15
- Underdog Day – December 16
- Unduvap Full Moon Poya – December 7
- UNICEF Birthday – December 11
- UNICEF Day for Change – December 11
- Unity Day Zimbabwe – December 22
- Universal Health Coverage Day – December 12
- Universal Human Rights Month – December 1
- Unlucky Day – December 31
- V.C. Bird Day – December 9
- Vijay Diwas – December 16
- Virgin of Caacupé Day – December 8
- Visit the Zoo Day – December 27
- Volunteerism Month (Philippines) – December 1
- Walt Disney Day – December 5
- Wear a Plunger on Your Head Day – December 18
- Wear Brown Shoes Day – December 4
- Weary Willie Day – December 9
- Winter Solstice – December 21
- World AIDS Day – December 1
- World Computer Literacy Day – December 2
- World Peace Meditation Day – December 31
- World Pollution Prevention Day – December 2
- World Snowboard Day – December 21
- World Soil Day – December 5
- World Trick Shot Day – December 6
- World Wildlife Conservation Day – December 4
- Worldwide Candle Lighting Day – December 10
- Worldwide Food Service Safety Month – December 1
- Wright Brother’s Day – December 17
- Yule – December 21