| January 1 | Global Family Day | #globalfamilyday |
| January 1 | National Bloody Mary Day | #nationalbloodymaryday |
| January 1 | National Hangover Day | #nationalhangoverday |
| January 1 | National Thank God It’s Monday Day | #thankgoditsmondayday |
| January 1 | New Years Day | #newyearsday |
| January 1 | Polar Bear Plunge Day | #polarplunge |
| January 1 | St. Basil’s Day | #saintbasilsday |
| January 1 | World Day of Peace | #worlddayofpeace |
| January 2 | 2nd January – Scotland | #newyear |
| January 2 | National Buffet Day | #nationalbuffetday |
| January 2 | National Cream Puff Day | #nationalcreampuffday |
| January 2 | National Personal Trainer Awareness Day | #personaltrainerawarenessday |
| January 2 | National Science Fiction Day | #sciencefictionday |
| January 2 | World Introvert Day | #worldintrovertday |
| January 3 | Festival of Sleep Day | #festivalofsleepday |
| January 3 | JRR Tolkien Day | #JRRTolkienDay |
| January 3 | National Chocolate Covered Cherry Day | #chocolatecoveredcherryday |
| January 3 | National Drinking Straw Day | #drinkingstrawday |
| January 3 | National Fruitcake Toss Day | #fruitcaketossday |
| January 4 | National Spaghetti Day | #nationalspaghettiday |
| January 4 | National Trivia Day | #nationaltriviaday |
| January 5 | National Bird Day | #nationalbirdday |
| January 5 | National Keto Day | #nationalketoday |
| January 5 | National Screenwriters Day | #nationalscreenwritersday |
| January 5 | National Whipped Cream Day | #whippedcreamday |
| January 6 | Feast of the Epiphany – Three Kings | #epiphany |
| January 6 | National Bean Day | #nationalbeanday |
| January 6 | National Cuddle Up Day | #nationalcuddleupday |
| January 6 | National Shortbread Day | #nationalshortbreadday |
| January 6 | National Technology Day | #technologyday |
| January 7 | National Bobblehead Day | #nationalbobbleheadday |
| January 7 | National Tempura Day | #nationaltempuraday |
| January 7 | Old Rock Day | #oldrockday |
| January 7 | Orthodox Christmas Day | #orthodoxchristmas |
| January 8 | National Argyle Day | #nationalargyleday |
| January 8 | National Bubble Bath Day | #bubblebathday |
| January 8 | National English Toffee Day | #englishtoffeday |
| January 8 | National JoyGerm Day | #nationaljoygermday |
| January 8 | National Winter Skin Relief Day | #winterskinreliefday |
| January 9 | National Apricot Day | #apricotday |
| January 9 | National Law Enforcement Appreciation Day (LEAD) | #lead |
| January 9 | National Static Electricity Day | #staticelectricityday |
| January 9 | Shop for Travel Day | #shopfortravelday |
| January 9 | Word Nerd Day | #wordnerdday |
| January 10 | Devonport Cup | #devonportcup |
| January 10 | National Bittersweet Chocolate Day | #bittersweetchocolateday |
| January 10 | National Cut Your Energy Costs Day | #cutyourenergycostsday |
| January 10 | National Houseplant Appreciation Day | #houseplantappreciationday |
| January 10 | National Oysters Rockefeller Day | #nationaloystersrockefellerday |
| January 10 | National Save The Eagles Day | #savetheeaglesday |
| January 11 | National Hot Toddy Day | #hottoddyday |
| January 11 | National Human Trafficking Awareness Day | #humantraffickingawarenessday |
| January 11 | National Milk Day | #nationalmilkday |
| January 11 | National Step in a Puddle and Splash Your Friend Day | #stepinapuddleandsplashyourfriendday |
| January 12 | International Kiss A Ginger Day | #kissagingerday |
| January 12 | National Curried Chicken Day | #curriedchickenday |
| January 12 | National Marzipan Day | #nationalmarzipanday |
| January 12 | National Pharmacist Day | #nationalpharmacistday |
| January 13 | Korean American Day | #koreanamericanday |
| January 13 | Make Your Dreams Come True Day | #makeyourdreamscometrueday |
| January 13 | National Clean Off Your Desk Day | #cleanoffyourdeskday |
| January 13 | National Peach Melba Day | #koreanamericanday |
| January 13 | National Rubber Ducky Day | #nationalrubberduckyday |
| January 13 | National Sticker Day | #nationalstickerday |
| January 13 | National Vision Board Day | #visionboardday |
| January 13 | Stephen Foster Memorial Day | #stephenfostermemorialday |
| January 14 | National Dress Up Your Pet Day | #dressupyourpetday |
| January 14 | National Hot Pastrami Sandwich Day | #hotpastramisandwichday |
| January 14 | National Sunday Supper Day | #sundaysupper |
| January 14 | Organize Your Home Day | #organizeyourhomeday |
| January 14 | Orthodox New Year | #orthodoxnewyear |
| January 14 | Ratification Day | #ratificationday |
| January 15 | Blue Monday | #bluemonday |
| January 15 | Martin Luther King Jr. Day | #mlkday |
| January 15 | National Bagel Day | #nationalbagelday |
| January 15 | National Booch Day | #nationalboochday |
| January 15 | National Hat Day | #nationalhatday |
| January 15 | National Strawberry Ice Cream Day | #strawberryicecreamday |
| January 16 | Appreciate a Dragon Day | #AppreciateADragonDay |
| January 16 | National Fig Newton Day | #nationalfignewtonday |
| January 16 | National Nothing Day | #nothingday |
| January 16 | National Religious Freedom Day | #religiousfreedomday |
| January 16 | National Without a Scalpel Day | #withoutascalpelday |
| January 17 | Benjamin Franklin Day | #benfranklinday |
| January 17 | Ditch New Year’s Resolution Day | #ditchnewyearsresolutionsday |
| January 17 | Kid Inventors’ Day | #kidinventorsday |
| January 17 | National Bootlegger’s Day | #bootleggersday or #templetonrye |
| January 17 | National Hot Buttered Rum Day | #hotbutteredrumday |
| January 18 | Get to Know Your Customers Day | #gettoknowyourcustomersday |
| January 18 | National Peking Duck Day | #nationalpekingduckday |
| January 18 | National Thesaurus Day | #nationalthesaurusday |
| January 18 | National Winnie The Pooh Day | #winniethepoohday |
| January 19 | National Popcorn Day | #nationalpopcornday. |
| January 19 | Tin Can Day | #tincanday |
| January 19 | World Quark Day | #worldquarkday |
| January 20 | National Buttercrunch Day | #nationalbuttercrunchday |
| January 20 | National Cheese Lover’s Day | #cheeseloversday |
| January 20 | National Disc Jockey Day | #nationaldiscjockeyday |
| January 21 | National Granola Bar Day | #nationalgranolabarday |
| January 21 | National Hugging Day | #nationalhuggingday |
| January 21 | Squirrel Appreciation Day | #squirrelappreciationday |
| January 22 | Celebration of Life Day | #celebrationoflifeday |
| January 22 | Community Manager Appreciation Day | #communitymanagerappreciationday |
| January 22 | Hot Sauce Day | #hotsauceday |
| January 22 | National Answer Your Cat’s Questions Day | #answeryourcatsquestionsday |
| January 22 | National Blonde Brownie Day | #blondebrownieday |
| January 23 | National Handwriting Day | #nationalhandwritingday |
| January 23 | National Pie Day | #nationalpieday |
| January 24 | Beer Can Appreciation Day | #beercanappreciationday |
| January 24 | Library Shelfie Day | #libraryshelfieday |
| January 24 | National Compliment Day | #nationalcomplimentday |
| January 24 | National Peanut Butter Day | #nationalpeanutbutterday |
| January 25 | Burns Night | #burnsnight |
| January 25 | National Irish Coffee Day | #nationalirishcoffeeday |
| January 25 | National Opposite Day | #nationaloppositeday |
| January 25 | Tu BiShvat | #NewYearForTrees |
| January 26 | Australia Day | #australiaday |
| January 26 | National Big Wig Day | #nationalbigwigday |
| January 26 | National Green Juice Day | #nationalgreenjuiceday |
| January 26 | National Peanut Brittle Day | #peanutbrittleday |
| January 26 | National Spouses Day | #nationalspousesday |
| January 27 | International Holocaust Remembrance Day | #holocaustremembranceday |
| January 27 | National Bubble Wrap Appreciation Day | #bubblewrapday |
| January 27 | National Chocolate Cake Day | #chocolatecakeday |
| January 27 | National Seed Swap Day | #nationalseedswapday |
| January 28 | Data Privacy Day | #dataprivacyday |
| January 28 | International Lego Day | #legoday |
| January 28 | National Blueberry Pancake Day | #blueberrypancakeday |
| January 28 | National Daisy Day | #daisyday |
| January 28 | National Have Fun At Work Day | #funatworkday |
| January 28 | National Kazoo Day | #nationalkazooday |
| January 29 | National Corn Chip Day | #nationalcornchipday |
| January 29 | National Puzzle Day | #nationalpuzzleday |
| January 30 | National Croissant Day | #nationalcroissantday |
| January 30 | Plan for Vacation Day | #planforvacation |
| January 31 | National Backward Day | #nationalbackwardday |
| January 31 | National Hot Chocolate Day | #nationalhotchocolateday |
| January 31 | National Inspire Your Heart With Art Day | #inspireyourheartwithartday |