May 3
- National Montana Day
- National SAN Architect Day
- National Textiles Day
- National Chocolate Custard Day
- National Garden Meditation Day
- National Lumpy Rug Day
- National Paranormal Day
- National Raspberry Popover Day
- National Specially-Abled Pets Day
- National Two Different Colored Shoes Day
- National Day of Prayer – First Thursday in May
- National Day of Reason – First Thursday in May
- World Password Day – First Thursday in May
May 4
- Bird Day
- National Candied Orange Peel Day
- National Orange Juice Day
- National Renewal Day
- National Star Wars Day
- National Weather Observers Day
- National Space Day – First Friday in May
- School Lunch Hero Day – First Friday in May
May 5
- National Silence the Shame Day *
- National Astronaut Day
- National Cartoonists Day
- Cinco de Mayo
- National Hoagie Day
- National Totally Chipotle Day
- National Homebrew Day – First Saturday in May
- Join Hands Day – First Saturday in May
- National Bombshells’ Day – First Saturday in May
- National Scrapbook Day – First Saturday in May
- National Start Seeing Monarchs Day – First Saturday in May
- National Train Day – Discontinued by Amtrak in 2016
- Free Comic Book Day – First Saturday in May
May 6
- National Beverage Day
- National Crepe Suzette Day
- National Nurses Day
- National Infertility Survival Day – Sunday before Mother’s Day
- National Lemonade Day – First Sunday in May
May 8
- National Coconut Cream Pie Day
- National Have A Coke Day
- National Student Nurse Day
- National Teacher Appreciation Day – Tuesday of the First Full Week in May
May 9
- National Sleepover Day
- National Butterscotch Brownie Day
- National Lost Sock Memorial Day
- National Moscato Day
- National School Nurse Day – Wednesday of National Nurses Week
- National Receptionists’ Day – Second Wednesday in May
- National Third Shift Workers Day – Second Wednesday in May
- National Bike to School Day – Changes Annually
May 10
- National Washington Day
- National Lipid Day
- National Shrimp Day
- National Clean Up Your Room Day
May 11
- National Foam Rolling Day
- National Twilight Zone Day
- National Eat What You Want Day
- National Military Spouse Appreciation Day – Friday Before Mother’s Day
- National Provider Appreciation Day – Friday Before Mother’s Day
May 12
- National Dog Mom’s Day* – Second Saturday in May
- National Fibromyalgia Awareness Day
- National Limerick Day
- National Nutty Fudge Day
- National Odometer Day
- National Babysitter’s Day – Saturday Before Mother’s Day
- National Birth Mother’s Day – Saturday Before Mother’s Day
- National Archery Day – Second Saturday in May
- National Cornelia De Lange Syndrome Awareness Day – Second Saturday in May
- National Miniature Golf Day – Second Saturday in May
- National Stamp Out Hunger Food Drive Day – Second Saturday in May
May 13
- National Crouton Day
- National Apple Pie Day
- National Frog Jumping Day
- National Fruit Cocktail Day
- Mother’s Day – Second Sunday in May
May 14
May 17
May 18
- National Cheese Souffle Day
- National HIV Vaccine Awareness Day
- National No Dirty Dishes Day
- National Visit Your Relatives Day
- National Bike to Work Day – Third Friday in May
- National Defense Transportation Day – Third Friday in May
- National Endangered Species Day – Third Friday in May
- National Pizza Party Day – Third Friday in May
- NASCAR Day – Third Friday in May
May 19
- National Devil’s Food Cake Day
- National May Ray Day
- National Armed Forces Day – Third Saturday in May
- National Learn to Swim Day – Third Saturday in May
May 22
- National Solitaire Day*
- National Buy a Musical Instrument Day
- National Maritime Day
- National Vanilla Pudding Day
May 23
- National Lucky Penny Day
- National Taffy Day
- Emergency Medical Services for Children – Wednesday of Emergency Medical Service Week
May 24
- National Wyoming Day
- National Escargot Day
- National Scavenger Hunt Day
- Aviation Maintenance Technician Day
- Brother’s Day
- Red Nose Day – Changes Annually
May 25
- National Brown-Bag It Day
- National Missing Children’s Day
- National Tap Dance Day
- National Wine Day
- Towel Day
- National Don’t Fry Day – Friday Before Memorial Day
- National Heat Awareness Day – Last Friday in May
May 28
- National Brisket Day
- National Hamburger Day
- Memorial Day – Last Monday in May
May 30
May 31
- National Utah Day
- National Autonomous Vehicle Day
- National Macaroon Day
- Necrotizing Fasciitis Awareness Day
- National Save Your Hearing Day
- National Speak in Sentences Day
*Proclamation for a New Day
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