Here is a list of links to strange, fun and unofficial holidays celebrated in January. Links in boldface are profiled on Worldwide Weird Holidays.
January 1
Shakespeare400 – 2016
Copyright Law Day
Euro Day
First Foot Day
Global Family Day
National Bloody Mary Day
National Ellis Island Day
New Year’s Day
New Year’s Dishonor List Day
Polar Bear Swim Day
Public Domain Day
January 2
National Buffet Day
National Cream Puff Day
National Motivation and Inspiration Day
National Run it Up the Flagpole and See if Anybody Salutes It Day
National Science Fiction Day
Personal Trainer Awareness Day
January 3
Festival of Sleep Day
Fruitcake Toss Day
Humiliation Day
Memento Mori Day
National Chocolate Covered Cherry Day
National Drinking Straw Day
National Write to Congress Day
January 4
National Trivia Day
National Spaghetti Day
National Weigh-In Day
Pop Music Chart Day
Tom Thumb Day
World Braille Day
January 5
National Whipped Cream Day
National Bird Day
January 6
Bean Day
Apple Tree Day
Cuddle Up Day
National Shortbread Day
National Smith Day
National Take Down the Christmas Tree Day
World Day for War Orphans
January 7
National Pass Gas Day
Harlem Globetrotter’s Day
I’m Not Going To Take It Anymore Day
International Programmers’ Day
National Bobblehead Day
National Old Rock Day
National Tempura Day
January 8
Show and Tell at Work Day
Argyle Day
Bubble Bath Day
Earth’s Rotation Day
National English Toffee Day
National Joygerm Day
War on Poverty Day
World Typing Day
January 9
Aviation in America Day
Balloon Ascension Day
National Apricot Day
National Clean Off Your Desk Day – 2017
National Static Electricity Day
National Word Nerd Day
Panama’s Martyr Day
January 10
Peculiar People Day
Houseplant Appreciation Day
National Bittersweet Chocolate Day
National Cut Your Energy Costs Day
January 11
Cigarettes Are Hazardous To Your Health Day
Learn Your Name in Morse Code Day
National Hot Toddy Day
National Milk Day
National Step in a Puddle and Splash Your Friend Day
Secret Pal Day
January 12
Kiss a Ginger Day
Curried Chicken Day
Feast of Fabulous Wild Men Day
National Marzipan Day
National Pharmacist Day
Stick To Your New Year’s Resolution Day
January 13
International Skeptics Day – 2017
National Rubber Ducky Day
Blame Someone Else Day – 2017
National Peach Melba Day
Public Radio Broadcasting Day
January 14
Caesarean Section Day
Feast of the Ass Day
National Dress Up Your Pet Day
National Hot Pastrami Sandwich Day
Organize Your Home Day
Ratification Day
January 15
National Hat Day
Birthday of Martin Luther King, Jr.
National Strawberry Ice Cream Day
Wikipedia Day
January 16
National Nothing Day
Appreciate a Dragon Day
International Hot and Spicy Food Day
National Fig Newton Day
National Good Teen Day
Prohibition Remembrance Day
January 17
Palomares Hydrogen Bomb Accident Day
Benjamin Franklin Day
Cable Car Day
Ditch New Year’s Resolution Day
Hot-Buttered Rum Day
Kid Inventors’ Day
National Hot Heads Chili Day
January 18
Thesaurus Day
National Gourmet Coffee Day
National Peking Duck Day
Winnie the Pooh Day
January 19
Tin Can Day
Brew a Potion Day
Good Memory Day
National Popcorn Day
Poe Toaster Day
January 20
National Disc Jockey Day
Camcorder Day
National Buttercrunch Day
National Cheese Lovers Day
Penguin Awareness Day
Take a Walk Outdoors Day
January 21
National Hugging Day
National Granola Bar Day
National New England Clam Chowder Day
One-Liners Day
Own Your Own Home Day
Squirrel Appreciation Day
January 22
National Hot Sauce Day
Answer Your Cat’s Questions Day
Come in From the Cold Day
Dance of the Seven Veils Day
National Blonde Brownie Day
January 23
National Handwriting Day
Measure Your Feet Day
National Pie Day
National Rhubarb Pie Day
January 24
Talk Like a Grizzled Prospector Day
Beer Can Appreciation Day
Belly Laugh Day
National Compliment Day
National Eskimo Pie Patent Day
National Lobster Thermidor Day
National Peanut Butter Day
January 25
National Opposite Day
A Room of One’s Own Day
Fluoride Day
Macintosh Computer Day
National Irish Coffee Day
January 26
Lotus 1-2-3 Day
National Peanut Brittle Day
Spouse’s Day
Toad Hollow Day of Encouragement
January 27
Thomas Crapper Day
Auschwitz Liberation Day
National Chocolate Cake Day
Punch the Clock Day
Vietnam Peace Day
January 28
Bubble Wrap Appreciation Day – 2019
American Fancy Rat and Mouse Show 2017 – Canceled
National Kazoo Day
Daisy Day
Data Privacy Day
National Blueberry Pancake Day
Pop Art Day
Thank a Plugin Developer Day
January 29
Curmudgeon’s Day
Freethinkers Day
National Corn Chip Day
National Puzzle Day
Seeing Eye Dog Day
Thomas Paine Day
January 30
American Fancy Rat and Mouse Show – 2016
National Croissant Day
National Escape Day
School Day of Non-Violence and Peace
Yodel for Your Neighbors Day
January 31
Scotch Tape Day
Backward Day
Brandy Alexander Day
Eat Brussels Sprouts Day
Hell is Freezing Over Day
Hug an Economist Day
Inspire Your Heart with Art Day
National Hot Chocolate Day