April 1st
- April Fools Day
- National One Cent Day
- National Sourdough Bread Day
- National Burrito Day – First Thursday in April
April 2nd
- National Ferret Day
- National Peanut Butter and Jelly Day
- National Reconciliation Day
- World Autism Awareness Day
April 3rd
- National Chocolate Mousse Day
- National Film Score Day
- National Find a Rainbow Day
- National Tweed Day
- World Party Day
- National Love Our Children Day – First Saturday In April
- National Handmade Day – First Saturday in April
April 4th
- National Chicken Cordon Bleu Day
- National Hug a Newsperson Day
- Jeep 4×4 Day
- National School Librarian Day
- National Vitamin C Day
- National Walk Around Things Day
- Easter – Changes Annually April 2020
- Geologists Day – First Sunday In April
April 5th
- First Contact Day
- Gold Star Spouses Day
- National Caramel Day
- National Deep Dish Pizza Day
- National Flash Drive Day
- National Go For Broke Day
- National Nebraska Day
- National Raisin and Spice Bar Day
- National Read a Road Map Day
April 6th
- National Caramel Popcorn Day
- New Beer’s Eve
- National Sorry Charlie Day
- National Student-Athlete Day
- National Tartan Day
- National Teflon Day
- SAAM Day of Action – First Tuesday in April
- National Library Workers Day – Tuesday of National Library Week
April 7th
- National Beer Day
- National Coffee Cake Day
- National Girl Me Too Day
- National No Housework Day
- National Bookmobile Day – Wednesday of National Library Week
- National Walking Day – First Wednesday in April
- Childhelp National Day of Hope – First Wednesday in April
April 8th
- National All is Ours Day
- National Empanada Day
- National Zoo Lovers Day
- National Alcohol Screening Day – Thursday of First Full Week in April
April 9th
- National Cherish an Antique Day
- National Chinese Almond Cookie Day
- National Former Prisoner of War Recognition Day
- National Name Yourself Day
- National Unicorn Day
- National Winston Churchill Day
- National Day of Silence – Changes Annually April 9, 2021
April 10th
- National Cinnamon Crescent Day
- Encourage a Young Writer Day
- National Farm Animals Day
- National Siblings Day
- Good Friday
April 11th
- National Barber Shop Quartet Day
- National Cheese Fondue Day
- National Eight Track Tape Day
- National Pet Day
- National Submarine Day
April 12th
- National For Twelves Day
- National Big Wind Day
- National Colorado Day
- National Grilled Cheese Sandwich Day
- National Licorice Day
April 13th
- National Make Lunch Count Day
- National Peach Cobbler Day
- National Scrabble Day
- National Thomas Jefferson Day
April 14th
- National Dolphin Day
- National Ex Spouse Day
- National Gardening Day
- National Pan American Day
- National Pecan Day
- National Reach as High as You Can Day
- Look up at the Sky Day
April 15th
- National Banana Day
- National Glazed Spiral Ham Day
- National Rubber Eraser Day
- National Take a Wild Guess Day
- National Tax Day
- National Titanic Remembrance Day
- Get to Know Your Customers Day – Third Thursday of Each Quarter
- National High Five Day – Third Thursday in April
April 16th
- National Bean Counter Day
- National Eggs Benedict Day
- National Healthcare Decisions Day
- National Orchid Day
- National Wear Your Pajamas to Work Day
- National Clean Out Your Medicine Cabinet Day – Third Friday in April
April 17th
- National Crawfish Day
- International Bat Appreciation Day
- National Cheeseball Day
- National Ellis Island Family History Day
- National Haiku Poetry Day
- National Record Store Day – Changes Annually
- National Auctioneers Day – Third Saturday in April
April 18th
April 19th
- National Amaretto Day
- National Garlic Day
- National Hanging Out Day
- National North Dakota Day
- National Oklahoma City Bombing Commemoration Day
April 20th
- National Cheddar Fries Day
- National Lima Bean Respect Day
- National Look Alike Day
- National Pineapple Upside Down Cake Day
April 21st
April 22nd
- National Earth Day
- National Girl Scout Leader’s Day
- National Jelly Bean Day
- National Teach Children To Save Day – Changes Annually April 22, 2021
- National Take Our Daughters and Sons to Work Day – Fourth Thursday in April
- National Administrative Professionals’ Day – Wednesday of Last Full Week in April
April 23rd
- National Cherry Cheesecake Day
- National Lost Dogs Awareness Day
- National Picnic Day
- National Take a Chance Day
- National Talk Like Shakespeare Day
- National Arbor Day – Last Friday in April
- National Hairball Awareness Day – Last Friday in April
April 24th
- National Pigs in a Blanket Day
- National Kiss of Hope Day – Last Saturday in April
- National Pool Opening Day – Last Saturday in April
- National Rebuilding Day – Last Saturday in April
- National Sense of Smell Day – Last Saturday in April
April 25th
- National DNA Day
- National East Meets West Day
- National Hug a Plumber Day
- National Telephone Day
- National Zucchini Bread Day
- National Pet Parents Day – Last Sunday in April
April 26th
- National Audubon Day
- National Dissertation Day
- National Help a Horse Day
- National Kids and Pets Day
- National Pretzel Day
- National Richter Scale Day
- National South Dakota Day
April 27th
April 28th
- National Blueberry Pie Day
- National BraveHearts Day
- National Great Poetry Reading Day
- National Superhero Day
- Workers’ Memorial Day
- Denim Day – Changes Annually
April 29th
April 30th
- National Adopt a Shelter Pet Day
- National Bubble Tea Day
- National Bugs Bunny Day
- National Honesty Day
- National Oatmeal Cookie Day
- National PrepareAthon! Day
- National Raisin Day
- National Sarcoidosis Day
- National Military Brats Day
- National Hairstylist Appreciation Day
- National Poem In Your Pocket Day – Changes Annually – April 23, 2020
- *Day * – Proclamation
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