National days, ongoing national weeks and months, and global observances for December 18, 2026. Plus historical events and birthdays.
December 18, 2026 celebrates National Twin Day, plus 3 more. Created in 2017 by National Day Calendar®.
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Answer the Telephone Like Buddy the Elf Day on December 18th encourages everyone to add some elf behavior to their day.
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National Underdog Day recognizes that America loves its underdogs. Each year on the third Friday in December, we cheer on the teams and individuals who are statistically expected to lose in competition.
Read the full story →Longer-running observances that include this date.
Universal Human Rights Month
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Bingo's Birthday Month
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Operation Santa Paws | December 1-24th
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National Drunk & Drugged Driving Prevention Month
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Learn A Foreign Language Month
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Safe Toys And Gifts Month
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International Sharps Injury Prevention Awareness Month
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Spiritual Literacy Month
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National Tie Month
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National Write A Business Plan Month
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Worldwide Food Service Safety Month
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Root Vegetables And Exotic Fruit Month
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Showing the first 12 — See all months for December.
