| March Equinox | |  |
| International Day of Happiness | | |
| Nowruz | | |
| World Storytelling Day | | |
| Independence Day | | |
| International Francophonie Day | | |
| National Ravioli Day | | |
| National Native HIV/AIDS Awareness Day | | |
| National Proposal Day | | |
| National Farm Rescuer Day | | |
| National Close the Gap Day | | |
| Spring Equinox | | |
| Absolutely Incredible Kid Day | | |
| National Kiss Your Fiance Day | | |
| National Macaron Day | | |
| French Language Day | | |
| National Snowman Burning Day | | |
| Won’t You Be My Neighbor Day | | |
| Companies That Care Day | | |
| Hufflepuff Pride Day | | |
| International Day for the Elimination of Racial Discrimination | | |
| World Poetry Day | | |
| World Down Syndrome Day | | |
| International Day of Forests | | |
| Nowruz | | |
| Harmony Day | | |
| Independence Day | | |
| Human Rights Day | | |
| National Common Courtesy Day | | |
| National Countdown Day | | |
| National Single Parent Day | | |
| National Fragrance Day | | |
| National California Strawberry Day | | |
| National French Bread Day | | |
| International Nowruz Day | | |
| Martyrdom of Imam Ali | | |
| Mother's Day | | |
| World Vermouth Day | | |
| National Healthy Fats Day | | |
| National Crunchy Taco Day | | |
| World Puppetry Day | | |
| Slytherin Pride Day | | |
| World Water Day | | |
| National Goof Off Day | | |
| National Bavarian Crepes Day | | |
| Emancipation Day | | |
| Nowruz Holiday | | |
| As Young As You Feel Day | | |
| Nowruz | | |
| Gryffindor Pride Day | | |
| Day Of The Sea | | |
| World Meteorological Day | | |
| Pakistan Day | | |
| Puppy Day | | |
| National Chia Day | | |
| National Chip and Dip Day | | |
| National Near Miss Day | | |
| National Melba Toast Day | | |
| Nowruz Holiday | | |
| Birthday of the Sultan of Johor | | |
| Southern Africa Liberation Day | | |
| World Atheist Day | | |
| Memorial Day | | |
| World Tuberculosis Day | | |
| International Day for the Right to the Truth concerning Gross Human Rights Violations and for the Dignity of Victims | | |
| National Chocolate Covered Raisin Day | | |
| St. Joseph's Day | | |
| Otago Anniversary Day | | |
| Commonwealth Covenant Day | | |
| Nowruz Holiday | | |
| National Cocktail Day | | |
| National Cheesesteak Day | | |
| Flatmate’s Day | | |
| Greek Independence Day | | |
| International Day of Remembrance of Slavery Victims and the Transatlantic Slave Trade | | |
| International Day of Solidarity with Detained and Missing Staff Members | | |
| Feast of the Annunciation | | |
| Struggle for Human Rights Day | | |
| Independence Day | | |
| Annunciation of the Lord | | |
| International Waffle Day | | |
| Anniversary of the Arengo | | |
| National Lobster Newburg Day | | |
| National Medal of Honor Day | | |
| National Tolkien Reading Day | | |
| National American Diabetes Association Alert Day | | |
| Maryland Day | | |
| Mother’s Day | | |
| National Day of Life, Peace and Justice | | |
| Make Up Your Own Holiday Day | | |
| Prince Jonah Kuhio Kalanianaole Day | | |
| Martyrs' Day | | |
| Purple Day | | |
| National Spinach Day | | |
| National Nougat Day | | |
| National Little Red Wagon Day | | |
| Manatee Appreciation Day | | |
| Laylat al-Qadr (Night of Power) | | |
| Laylat al-Qadr | | |
| Wear A Hat Day | | |
| American Red Cross Giving Day | | |
| Armed Forces' Day | | |
| National Scribble Day | | |
| National Joe Day | | |
| National Spanish Paella Day | | |
| International Whisk(e)y Day | | |
| World Theatre Day | | |
| Quirky Country Music Song Titles Day | | |
| Children's Picture Book Day | | |
| Eat an Eskimo Pie Day | | |
| National Black Forest Cake Day | | |
| National Something On a Stick Day | | |
| Weed Appreciation Day | | |
| National Triglycerides Day | | |
| Respect Your Cat Day | | |
| Youth Day | | |
| Martyrs' Day | | |
| Smoke and Mirrors Day | | |
| Commemoration of Boganda | | |
| National Vietnam War Veterans Day | | |
| National Mom and Pop Business Owners Day | | |
| National Lemon Chiffon Cake Day | | |
| Earth Hour | | |
| World Piano Day | | |
| Nano Days | | |
| International Mermaid Day | | |
| Niagara Falls Runs Dry Day | | |
| Spiritual Baptist Liberation Day | | |
| National Doctors' Day | | |
| National Take a Walk in the Park Day | | |
| National I Am in Control Day | | |
| National Pencil Day | | |
| National Turkey Neck Soup Day | | |
| National Virtual Vacation Day | | |
| Ugadi | | |
| Eid al-Fitr (End of Ramadan) | | |
| Mother's Day | | |
| Mothering Sunday | | |
| National Neighbor Day | | |
| Pretzel Sunday | | |
| Transfer Day | | |
| Freedom Day | | |
| Micronesia Culture Day (Chuuk & Pohnpei) | | |
| National Crayon Day | | |
| National Tater Day | | |
| National Bunsen Burner Day | | |
| National Clams on the Half Shell Day | | |
| National Prom Day | | |
| Eid al-Fitr (End of Ramadan) | | |
| Seward's Day | | |
| César Chávez Day | | |
| Hari Raya Puasa | | |
| World Backup Day | | |
| National Farm Workers Day | | |
| Eiffel Tower Day | | |
| National Cream Cheese Frosting Day | | |
| National Day | | |
| Investiture of the Captains Regent | | |
| April Fool's Day | | |
| National Poetry Month | | |
| National One Cent Day | | |
| National Sourdough Bread Day | | |
| SAAM Day of Action | | |
| Eid al-Fitr (End of Ramadan) Holiday | | |
| National Atheist Day | | |
| Sexual Assault Awareness Month | | |
| World Sarcoidosis Awareness Month | | |
| Fun Day | | |
| International Fun At Work Day | | |
| Reading Is Funny Day | | |
| National Garden Month | | |
| Summer Tire Changeover Month | | |
| National Soft Pretzel Month | | |
| National Afternoon Tea Month | | |
| National Autism Awareness Month | | |
| National Month Of Hope | | |
| National Humor Month | | |
| National Safe Digging Month | | |
| Adopt A Ferret Month | | |
| National Pecan Month | | |
| National Fresh Celery Month | | |
| National Brunch Month | | |
| International Guitar Month | | |
| Active Dog Month | | |
| National Decorating Month | | |
| Month Of The Military Child | | |
| National Straw Hat Month | | |
| National Welding Month | | |
| National Canine Fitness Month | | |
| Limb Loss And Limb Difference Awareness Month | | |
| National Cannabis Awareness Month | | |
| National Soy Foods Month | | |
| Stress Awareness Month | | |
| National Jazz Appreciation Month | | |
| National Child Abuse Awareness Month | | |
| Day of the Veterans | | |
| Union Day of Belarus and Russia | | |
| International Children's Book Day | | |
| National Reconciliation Day | | |
| National Peanut Butter and Jelly Day | | |
| National Ferret Day | | |
| National Walking Day | | |
| Childhelp National Day of Hope | | |
| Pascua Florida Day | | |
| World Autism Awareness Day | | |
| Eid al-Fitr (End of Ramadan) Holiday | | |
| National Film Score Day | | |
| National Tweed Day | | |
| National Chocolate Mousse Day | | |
| National Find a Rainbow Day | | |
| National Burrito Day | | |
| Eid al-Fitr (End of Ramadan) Holiday | | |
| Näfelser Fahrt | | |
| World Party Day | | |
| World Aquatic Animal Day | | |
| Fish Fingers And Custard Day | | |
| International Day for Mine Awareness and Assistance in Mine Action | | |
| Peace Day | | |
| Independence Day | | |
| National Vitamin C Day | | |
| National Walk Around Things Day | | |
| National Hug a Newsperson Day | | |
| National School Librarian Day | | |
| National Chicken Cordon Bleu Day | | |
| Jeep 4×4 Day | | |
| Children's Day | | |
| Tell a Lie Day | | |
| Walk to Work Day | | |
| International Carrot Day | | |
| Poet In A Cupcake Day | | |
| World Rat Day | | |
| D.A.R.E. Day | | |
| First Contact Day | | |
| National Flash Drive Day | | |
| National Go For Broke Day | | |
| National Caramel Day | | |
| National Read a Road Map Day | | |
| National Raisin and Spice Bar Day | | |
| National Deep Dish Pizza Day | | |
| National Love Our Children Day | | |
| Tomb Sweeping Day (Qing Ming Jie) | | |
| Arbor Day | | |
| National Handmade Day | | |
| International Day Of Conscience | | |
| Hospital Admitting Clerks Day | | |
| National DIY Day | | |
| International Pillow Fight Day | | |
| International Firewalk Day | | |
| Tangible Karma Day | | |
| International Day of Sport for Development and Peace | | |
| Chakri Day | | |
| National Tartan Day | | |
| President Ntaryamira Day | | |
| National Sorry Charlie Day | | |
| New Beer’s Eve | | |
| National Caramel Popcorn Day | | |
| National Student-Athlete Day | | |
| National Teflon Day | | |
| A Drop of Water - A grain of Gold | | |
| Ramanavami | | |
| Geologists’ Day | | |
| National Siamese Cat Day | | |
| Army Day in United States | | |
| National Acai Bowl Day | | |
| Plan Your Epitaph Day | | |
| Motherhood and Beauty Day | | |
| Health Day | | |
| World Health Day | | |
| Day of Remembrance of the Victims of the Rwanda Genocide | | |
| Mozambican Woman's Day | | |
| Karume Day | | |
| Tutsi Genocide Memorial Day | | |
| National Beer Day | | |
| National Coffee Cake Day | | |
| National No Housework Day | | |
| National Girl Me Too Day | | |
| Hung Kings Festival | | |
| International Beaver Day | | |
| International Romani Day | | |
| National All is Ours Day | | |
| National Zoo Lovers Day | | |
| National Empanada Day | | |
| National Library Workers Day | | |
| Yom HaAliyah | | |
| Be Kind to Lawyers Day | | |
| Equal Pay Day | | |
| Draw A Picture Of A Bird Day | | |
| National Pygmy Hippo Day | | |
| Independence Restoration Day | | |
| Vimy Ridge Day | | |
| Constitution Day of the Republic of Kosovo | | |
| Martyrs' Day | | |
| National Cherish an Antique Day | | |
| National Name Yourself Day | | |
| National Winston Churchill Day | | |
| National Chinese Almond Cookie Day | | |
| National Former Prisoner of War Recognition Day | | |
| National Education and Sharing Day | | |
| The Day of Valor | | |
| National Unicorn Day | | |
| Siblings Day | | |
| National Cinnamon Crescent Day | | |
| National Farm Animals Day | | |
| National Alcohol Screening Day | | |
| Mahavir Jayanti | | |
| National Hug Your Dog Day | | |
| Golfer’s Day | | |
| International Safety Pin Day | | |
| Battle of Rivas | | |
| National Pet Day | | |
| National Barber Shop Quartet Day | | |
| National Submarine Day | | |
| National Eight Track Tape Day | | |
| National Cheese Fondue Day | | |
| The Day of Silence | | |
| World Parkinson’s Day | | |
| International Day of Human Space Flight | | |
| Grilled Cheese Day | | |
| Yuri's Night | | |
| National Big Wind Day | | |
| National Licorice Day | | |
| National Grilled Cheese Sandwich Day | | |
| Passover Eve | | |
| Children´s Day | | |
| God of Medicine's Birthday | | |
| Hanuman Jayanti | | |
| Walk On Your Wild Side Day | | |
| World Hamster Day | | |
| Deskfast Day | | |
| National Only Child Day | | |
| Unfairly Prosecuted Persons Day | | |
| National Scrabble Day | | |
| National Thomas Jefferson Day | | |
| National Peach Cobbler Day | | |
| National Make Lunch Count Day | | |
| Palm Sunday | | |
| Passover (First Day) | | |
| Thomas Jefferson's Birthday | | |
| Theravada New Year | | |
| Songkran | | |
| International FND Awareness Day | | |
| America Day | | |
| Ambedkar Jayanti | | |
| Look up the Sky Day | | |
| Cake and Cunnilingus Day | | |
| National Gardening Day | | |
| National Reach as High as You Can Day | | |
| National Pan American Day | | |
| National Ex Spouse Day | | |
| National Dolphin Day | | |
| National Pecan Day | | |
| Passover (2nd Day) | | |
| International Moment of Laughter Day | | |
| Vaisakhi / Baisakhi / Vishu | | |
| Vaisakhi | | |
| National Look Up At The Sky Day | | |
| World Chagas Disease Day | | |
| Songkran | | |
| Birth Date of Kim Il Sung | | |
| Father Damien Day | | |
| National Take a Wild Guess Day | | |
| National Rubber Eraser Day | | |
| National Titanic Remembrance Day | | |
| National Glazed Spiral Ham Day | | |
| Tax Day | | |
| Passover (3rd Day) | | |
| Declaration of Malacca as Historical City | | |
| Husband Appreciation Day | | |
| National Anime Day | | |
| National ASL Day | | |
| Songkran | | |
| International Microvolunteering Day | | |
| National That Sucks Day | | |
| National Orchid Day | | |
| National Eggs Benedict Day | | |
| National Wear Your Pajamas to Work Day | | |
| National Healthcare Decisions Day | | |
| National Bean Counter Day | | |
| Emancipation Day | | |
| Passover (4th Day) | | |
| Songkran observed | | |
| National Banana Day | | |
| Save The Elephant Day | | |
| National Librarian Day | | |
| Independence Day | | |
| Women's Rights Day | | |
| Herbalist Day | | |
| National Bat Appreciation Day | | |
| National Ellis Island Family History Day | | |
| National Haiku Poetry Day | | |
| National Cheeseball Day | | |
| National High Five Day | | |
| Get to Know Your Customers Day | | |
| Maundy Thursday | | |
| Flag Day | | |
| Passover (5th Day) | | |
| Blah Blah Blah Day | | |
| National Kickball Day | | |
| National Ford Mustang Day | | |
| College Student Grief Awareness Day | | |
| World Hemophilia Day | | |
| Nothing Like A Dame Day | | |
| Birthday of Guru Angad Dev | | |
| International Day for Monuments and Sites | | |
| Independence Day | | |
| National Lineman Appreciation Day | | |
| National Columnists’ Day | | |
| National Animal Crackers Day | | |
| Good Friday | | |
| Orthodox Good Friday | | |
| Passover (6th Day) | | |
| Coptic Good Friday | | |
| Ethiopian Good Friday | | |
| Fast and Prayer Day | | |
| National Piñata Day | | |
| Pet Owners Independence Day | | |
| Declaration of Independence | | |
| Bicycle Day | | |
| National Hanging Out Day | | |
| National Oklahoma City Bombing Commemoration Day | | |
| National Garlic Day | | |
| National Amaretto Day | | |
| National Auctioneers Day | | |
| Holy Saturday | | |
| Orthodox Holy Saturday | | |
| Passover (7th Day) | | |
| Landing of the 33 orientals | | |
| Passover (Last Day) | | |
| Coptic Holy Saturday | | |
| Birthday of King Mswati III | | |
| National Rice Ball Day | | |
