April 2nd
- National Ferret Day
- National Peanut Butter and Jelly Day
- National Reconciliation Day
- SAAM Day of Action – First Tuesday in April
- National Equal Pay Day – A Tuesday in April – Changes Annually
April 3rd
- National Film Score Day
- National Chocolate Mousse Day
- World Party Day
- National Find a Rainbow Day
- National Tweed Day
- National Walking Day – First Wednesday in April
- Childhelp National Day of Hope – First Wednesday in April
April 4th
- National Vitamin C Day*
- Jeep 4×4 Day
- National Chicken Cordon Bleu Day
- National Hug a Newsperson Day
- National School Librarian Day
- National Walk Around Things Day
- National Burrito Day – 1st Thursday of April
April 6th
April 10th
- National Cinnamon Crescent Day
- National Encourage a Young Writer Day
- National Farm Animals Day
- National Siblings Day
- National Bookmobile Day – Wednesday of National Library Week
April 11th
- National Barber Shop Quartet Day
- National Cheese Fondue Day
- National Eight Track Tape Day
- National Pet Day
- National Submarine Day
- National Alcohol Screening Day – Thursday of the First Full Week in April
April 12th
- National Colorado Day
- National Big Wind Day
- National Grilled Cheese Sandwich Day
- National Licorice Day
- National Donate Life Blue and Green Day – Changes Annually
- Nation Teach Children to Save Day – Changes Annually
- National Day of Silence – Changes Annually
April 16th
- National Orchid Day
- National Bean Counter Day
- National Eggs Benedict Day
- National Healthcare Decisions Day
- National Wear Your Pajamas to Work Day
- National Education and Sharing Day – Changes Annually – 11th day of the month of Nisan on the Jewish calendar
April 18th
- National Animal Crackers Day
- National Columnists’ Day
- National Lineman Appreciation Day
- National High Five Day – Third Thursday in April
- National Get to Know Your Customers Day – Third Thursday of Each Quarter
April 20th
- National Cheddar Fries Day
- National Lima Bean Respect Day
- National Look Alike Day
- National Pineapple Upside Down Cake Day
- National Auctioneers Day – Third Saturday in April
- National Record Store Day – Third Saturday in April
April 21st
April 24th
- National Pigs in a Blanket Day
- National Administrative Professionals Day – Wednesday of Last Full Week 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 Take Our Sons and Daughters to Work Day – Fourth Thursday in April
- National Poem in Your Pocket Day – Changes Annually
April 26th
- National Dissertation Day
- National South Dakota Day
- National Audubon Day
- National Help a Horse Day
- National Kids and Pets Day
- National Pretzel Day
- National Richter Scale Day
- National Arbor Day – Last Friday in April
- National Hairball Awareness Day – Last Friday in April
April 27th
- National Devil Dog Day
- National Babe Ruth Day
- National Prime Rib Day
- National Tell a Story Day
- National Rebuilding Day – Last Saturday in April
- National Sense of Smell Day – Last Saturday in April
- National Pool Opening Day – Last Saturday in April
- Independent Bookstore Day – Last Saturday in April
- National Kiss of Hope Day – Last Saturday in April
April 28th
April 30th
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