| March 1 | National Dadgum That’s Good Day | #DadgumThatsGoodDay |
| March 1 | National Dress in Blue Day | #DressInBlueDay |
| March 1 | National Employee Appreciation Day | #EmployeeAppreciationDay |
| March 1 | National Fruit Compote Day | #NationalFruitCompoteDay |
| March 1 | National Horse Protection Day | #HorseProtectionDay |
| March 1 | National Peanut Butter Lover’s Day | #PeanutButterLoversDay |
| March 1 | National Pig Day | #NationalPigDay |
| March 1 | National Speech and Debate Education Day | #SpeechAndDebateEducationDay |
| March 1 | Plan a Solo Vacation Day | #PlanASoloVacationDay |
| March 1 | Self-Injury Awareness Day (SIAD) | #SelfInjuryAwarenessDay |
| March 1 | St. David’s Day | #StDavidsDay |
| March 1 | World Compliment Day | #WorldComplimentDay |
| March 1 | Zero Discrimination Day | #ZeroDiscriminationDay |
| March 2 | National Banana Cream Pie Day | #BananaCreamPieDay |
| March 2 | National Old Stuff Day | #NationalOldStuffDay |
| March 2 | National Read Across America Day (Dr. Seuss’s BirthDay) | #ReadAcrossAmericaDay |
| March 2 – 3 | National Day of Unplugging | #NationalDayOfUnplugging |
| March 3 | Finisher’s Medal Day | #FinishersMedalDay |
| March 3 | National Anthem Day | #NationalAnthemDay |
| March 3 | National Cold Cuts Day | #NationalColdCutsDay |
| March 3 | National I Want You to be Happy Day | #IWantYouToBeHappyDay |
| March 3 | National Mulled Wine Day | #NationalMulledWineDay |
| March 3 | Soup It Forward Day | #SoupItForwardDay |
| March 4 | Labour Day – Western Australia | #LabourDay |
| March 4 | March Forth and Do Something Day | #MarchForth |
| March 4 | Marching Music Day | #MarchingMusicDay |
| March 4 | National Grammar Day | #NationalGrammarDay |
| March 4 | National Hug a G.I. Day | #HugAGIDay |
| March 4 | National Pound Cake Day | #NationalPoundCakeDay |
| March 5 | Cinco de Marcho | #CincoDeMarcho |
| March 5 | King Island Show | #KingIslandShow |
| March 5 | National Absinthe Day | #NationalAbsintheDay |
| March 5 | National Cheese Doodle Day | #NationalCheeseDoodleDay |
| March 5 | National Multiple Personality Day | #MultiplePersonalityDay |
| March 6 | National Dentist’s Day | #NationalDentistsDay |
| March 6 | National Dress Day | #NationalDressDay |
| March 6 | National Frozen Food Day | #NationalFrozenFoodDay |
| March 6 | National Oreo Cookie Day | #NationalOreoCookieDay |
| March 6 | National White Chocolate Cheesecake Day | #WhiteChocolateCheesecakeDay |
| March 7 | National Be Heard Day | #NationalBeHeardDay |
| March 7 | National Cereal Day | #NationalCerealDay |
| March 7 | National Crown of Roast Pork Day | #CrownRoastOfPorkDay |
| March 7 | National Hospitalist Day | #NationalHospitalistDay |
| March 8 | International Women’s Day | #InternationalWomensDay |
| March 8 | International Women’s Day | #InternationalWomensDay |
| March 8 | National Peanut Cluster Day | #PeanutClusterDay |
| March 8 | National Proofreading Day | #NationalProofreadingDay |
| March 9 | National Barbie Day | #NationalBarbieDay |
| March 9 | National Crabmeat Day | #NationalCrabMeatDay |
| March 9 | National Get Over it Day | #NationalGetOverItDay |
| March 9 | National Meatball Day | #NationalMeatballDay |
| March 10 | Daylight Savings Time | #DaylightSavings |
| March 10 | Landline Telephone Day | #LandlineTelephoneDay |
| March 10 | National Blueberry Popover Day | #BlueberryPopoverDay |
| March 10 | National Mario Day | #NationalMarioDay |
| March 10 | National Pack Your Lunch Day | #PackYourLunchDay |
| March 10 | National Women and Girls HIV/AIDS Awareness Day | #WomenGirlsHIVAIDSAwarenessDay |
| March 10 | Mothering Sunday | #MotheringDay |
| March 11 | Adelaide Cup | #AdelaideCup |
| March 11 | Canberra Day | #CanberraDay |
| March 11 | Commonwealth Day | #CommonwealthDay |
| March 11 | Eight Hours Day | #EightHoursDay |
| March 11 | Johnny Appleseed Day | #JohnnyAppleseedDay |
| March 11 | Labour Day – Victoria, Australia | #LabourDay |
| March 11 | National Funeral Director and Mortician Recognition Day | #FuneralDirectorMorticianAppreciation |
| March 11 | National Napping Day | #NappingDay |
| March 11 | National Promposal Day | #PromposalDay |
| March 11 | Oatmeal Nut Waffles Day | #OatmealNutWafflesDay |
| March 11 | Ramadan Starts | #Ramadan |
| March 11 | Registered Dietitian Nutritionist Day | #RegisteredDietitianNutritionistDay |
| March 11 | Worship of Tools Day | #WorshipOfToolsDay |
| March 12 | Girl Scout Day | #NationalGirlScoutDay |
| March 12 | National Alfred Hitchcock Day | #AlfredHitchcockDay |
| March 12 | National Baked Scallops Day | #BakedScallopsDay |
| March 12 | National Plant a Flower Day | #PlantAFlowerDay |
| March 13 | Earmuff Day | #EarmuffDay |
| March 13 | National Coconut Torte Day | #NationalCoconutTorteDay |
| March 13 | National Good Samaritan Day | #GoodSamaritanDay |
| March 13 | National Jewel Day | #NationalJewelDay |
| March 13 | National K9 Veterans Day | #NationalK9VeteransDay |
| March 13 | National No Smoking Day | #nationalnosmokingday |
| March 13 | National Open an Umbrella Indoors Day | #OpenAnUmbrellaIndoorsDay |
| March 14 | Learn About Butterflies Day | #LearnAboutButterfliesDay |
| March 14 | National Children’s Craft Day | #ChildrensCraftDay |
| March 14 | National Pi Day | #PiDay |
| March 14 | National Potato Chip Day | #NationalPotatoChipDay |
| March 14 | National Write Your Story Day | #WriteYourStoryDay |
| March 14 | World Kidney Day | #WorldKidneyDay |
| March 15 | Everything You Think is Wrong Day | #EverythingYouThinkIsWrongDay |
| March 15 | Ides of March | #IdesOfMarch |
| March 15 | National Pears Helene Day | #NationalPearsHeleneDay |
| March 15 | National Shoe the World Day | #NationalShoeTheWorldDay |
| March 16 | Freedom of Information Day | #FreedomOfInformationDay |
| March 16 | National Artichoke Hearts Day | #ArtichokeHeartsDay |
| March 16 | National Corn Dog Day | #NationalCornDogDay |
| March 16 | National Everything You Do is Right Day | #EverythingYouDoIsRightDay |
| March 16 | National Panda Day | #NationalPandaDay |
| March 16 | National Quilting Day | #NationalQuiltingDay |
| March 17 | Corned Beef and Cabbage Day | #CornedBeefAndCabbageDay |
| March 17 | St. Patrick’s Day | #StPatricksDay |
| March 17 | Submarine Day | #SubmarineDay |
| March 18 | Awkward Moments Day | #AwkwardMomentsDay |
| March 18 | National Biodiesel Day | #NationalBiodieselDay |
| March 18 | National Lacy Oatmeal Cookie Day | #LacyOatmealCookieDay |
| March 18 | National Sloppy Joe Day | #NationalSloppyJoeDay |
| March 18 | National Supreme Sacrifice Day | #SupremeSacrificeDay |
| March 19 | Certified Nurses Day | #CertifiedNursesDay |
| March 19 | First Day of Spring | #FirstDayofSpring |
| March 19 | Let’s Laugh Day | #LetsLaughDay |
| March 19 | National Ag Day | #NationalAgDay |
| March 19 | National Chocolate Caramel Day | #ChocolateCaramelDay |
| March 19 | National Poultry Day | #NationalPoultryDay |
| March 19 | Proposal Day | #ProposalDay |
| March 19 | World Social Work Day | #WSWD |
| March 19 | World Storytelling Day | #WorldStorytellingDay |
| March 20 | French Language Day | #FrenchLanguageDay |
| March 20 | International Day of Happiness | #DayOfHappiness |
| March 20 | March Equinox | #AutumnEquinox |
| March 20 | National Native HIV/AIDS Awareness Day | #NativeHIVAIDSAwarnessDay |
| March 20 | National Ravioli Day | #NationalRavioliDay |
| March 20 | National Small Business Development Centers (SBDC) Day | #SBDCDay |
| March 20 | Spring Equinox | #springequinox |
| March 20 | Take Down Tobacco National Day of Action | #TakeDownTobacco |
| March 20 | Vernal Equinox Day | #vernalequinox |
| March 21 | Absolutely Incredible Kid Day | #AbsolutelyIncredibleKidDay |
| March 21 | Fast of Esther | #FastofEsther |
| March 21 | Harmony Day | #HarmonyDay |
| March 21 | National California Strawberry Day | #CaliforniaStrawberryDay |
| March 21 | National Common Courtesy Day | #CommonCourtesyDay |
| March 21 | National Countdown Day | #321Day |
| March 21 | National Fragrance Day | #NationalFragranceDay |
| March 21 | National French Bread Day | #NationalFrenchBreadDay |
| March 21 | National Single Parents Day | #NationalSingleParentDay |
| March 21 | World Down Syndrome Day | #WorldDownSyndromeDay |
| March 21 | World Forestry Day | #WorldForestryDay |
| March 21 | World Poetry Day | #WorldPoetryDay |
| March 22 | National Bavarian Crepes Day | #BavarianCrepesDay |
| March 22 | National Goof Off Day | #NationalGoofOffDay |
| March 22 | National Sing Out Day | #SingOutDay |
| March 22 | World Water Day | #WorldWaterDay |
| March 23 | National Chia Day | #NationalChiaDay |
| March 23 | National Chip and Dip Day | #NationalChipAndDipDay |
| March 23 | National Melba Toast Day | #NationalMelbaToastDay |
| March 23 | National Puppy Day | #NationalPuppyDay |
| March 23 | Near Miss Day | #NearMissDay |
| March 23 | Purim Eve | #Purim |
| March 23 | World Meteorological Day | #MeteorologicalDay |
| March 23 | Earth Hour | #EarthHour #Connect2Earth |
| March 24 | National Cheesesteak Day | #NationalCheesesteakDay |
| March 24 | National Chocolate Covered Raisin Day | #ChocolateCoveredRaisinDay |
| March 24 | Palm Sunday | #PalmSunday |
| March 24 | Purim | #Purim |
| March 24 | World Tuberculosis Day | #WorldTbDay |
| March 25 | National Lobster Newburg Day | #LobsterNewburgDay |
| March 25 | National Medal of Honor Day | #MedalOfHonorDay |
| March 25 | National Tolkien Reading Day | #TolkienReadingDay |
| March 25 | Shushan Purim | #Purim |
| March 26 | American Diabetes Association Alert Day | #AmericanDiabetesAssociationAlertDay |
| March 26 | National Make Up Your Own Holiday Day | #MakeUpYourOwnHolidayDay |
| March 26 | National Nougat Day | #NationalNougatDay |
| March 26 | National Spinach Day | #NationalSpinachDay |
| March 26 | Purple Day – International Epilepsy Day | #PurpleDay |
| March 27 | International Scribble Day | #ScribbleDay |
| March 27 | Manatee Appreciation Day | #ManateeApprecicationDay |
| March 27 | National Joe Day | #NationalJoeDay |
| March 27 | National Little Red Wagon Day | #LittleRedWagonDay |
| March 27 | National Spanish Paella Day | #SpanishPaellaDay |
| March 28 | Children’s Picture Book Day | #ChildrensPictureBookDay |
| March 28 | Eat an Eskimo Pie Day | #EatAnEskimoPieDay |
| March 28 | Maundy Thursday | #HolyThursday |
| March 28 | National Black Forest Cake Day | #BlackForestCakeDay |
| March 28 | National Something on a Stick Day | #SomethingOnAStickDay |
| March 28 | National Triglycerides Day | #NationalTriglyceridesDay |
| March 28 | National Weed Appreciation Day | #WeedAppreciationDay |
| March 28 | Respect Your Cat Day | #RespectYourCatDay |
| March 29 | Good Friday | #GoodFriday |
| March 29 | National Lemon Chiffon Cake Day | #LemonChiffonCakeDay |
| March 29 | National Mom and Pop Business Owners Day | #MomPopBusinessOwnersDay |
| March 29 | National Vietnam War Veterans Day | #VietnamWarVeteransDay |
| March 29 | Smoke and Mirrors Day | #SmokeAndMirrorsDay |
| March 30 | Holy Saturday | #EasterWeekend |
| March 30 | National Doctors Day | #NationalDoctorsDay |
| March 30 | National I Am in Control Day | #NationalIAmInControlDay |
| March 30 | National Virtual Vacation Day | #VirtualVacationDay |
| March 30 | Pencil Day | #PencilDay |
| March 30 | Take a Walk in the Park Day | #TakeAWalkInTheParkDay |
| March 30 | Turkey Neck Soup Day | #TurkeyNeckSoupDay |
| March 31 | Daylight Saving Time Starts | #DaylightSavings |
| March 31 | Easter | #Easter |
| March 31 | International Transgender Day of Visibility | #InternationalTransgenderDayOfVisibility |
| March 31 | National Bunsen Burner Day | #NationalBunsenBurnerDay |
| March 31 | National Clams on the Half Shell Day | #ClamsOnTheHalfShellDay |
| March 31 | National Crayon Day | #NationalCrayonDay |
| March 31 | National Farm Workers Day | #FarmWorkersDay |
| March 31 | National Prom Day | #NationalPromDay |
| March 31 | National Tater Day | #NationalTaterDay |
| March 31 | World Backup Day | #WorldBackupDay |
