May Holidays & National Days & Fun Days | May Calendar
| May 01 | May 02 | May 03 | May 04 | May 05 |
| May 06 | May 07 | May 08 | May 09 | May 10 |
| May 11 | May 12 | May 13 | May 14 | May 15 |
| May 16 | May 17 | May 18 | May 19 | May 20 |
| May 21 | May 22 | May 23 | May 24 | May 25 |
| May 26 | May 27 | May 28 | May 29 | May 30 |
| May 31 |
May Month-Long Holidays
- American Cheese Month
- American Wetlands Month
- Arthritis Awareness Month
- Asian American and Pacific Islander Heritage Month
- Asthma Awareness Month
- Awareness of Medical Orphans Month
- Be Kind to Animals Month
- Better Hearing and Speech Month
- Better Sleep Month
- Breath Easy Month
- Chip Your Pet Month
- Clean Air Month
- Correct Posture Month
- Deck Safety Month
- Digestive Diseases Awareness Month
- Electromagnetic Radiation Awareness Month
- Employee Health & Fitness Month
- Family Wellness Month
- Fibromyalgia Education and Awareness Month
- Food Allergy Awareness Month
- Fungal Infection Awareness Month
- Gardening for Wildlife Month
- Get Caught Reading Month
- Gifts from the Garden Month
- Global Employee Health and Fitness Month
- Global Youth Traffic Safety Month
- Haitian Heritage Month
- Heal the Children Month
- Healthy Vision Month/UV Safety
- High Blood Pressure Awareness Month
- Home Schooling Awareness Month
- Huntington’s Disease Awareness Month
- International Business Image Improvement Month
- International Civility Awareness Month
- International Drum Month
- International Internal Audit Awareness Month
- International Respect for Chickens Month
- International Victorious Woman Month
- Internet and E-Commerce Services Month
- Jewish American Heritage Month
- Labor History Month
- Latino Books Month
- Lupus Awareness Month
- Lyme Disease Awareness Month
- MCS Awareness Month
- Melanoma / Skin Cancer Detection and Prevention Month
- Mental Health Month
- Motorcycle Safety Awareness Month
- National Asparagus Month
- National Allergy and Asthma Awareness Month
- National Barbeque Month
- National Bicycle Safety Month
- National Celiac Disease Awareness Month
- National Chocolate Custard Month
- National Comfort Month
- National Community Action Month
- National Cystic Fibrosis Awareness Month
- National Date Your Mate Month
- National Duckling Month
- National Egg Month
- National Family Month (May 13 – June 17)
- National Foster Care Month
- National Gazpacho Aficionado Month
- National Good Car-Keeping Month
- National Guy Pride Month
- National Hamburger Month
- National Hepatitis Awareness Month
- National High Blood Pressure Education Month
- National Inventors Month
- National Kite Month – March 28 – May 3, 2016
- National Meditation Month
- National Mediterranean Diet Month
- National Mental Health Month
- National Military Appreciation Month
- National Moving Month
- National Osteoporosis Awareness and Prevention Month
- National Pet Month
- National Photo Month
- National Physical Fitness and Sports Month
- National Preservation Month
- National Prom Graduation Safety Month
- National Recommitment Month
- National Salad Month
- National Salsa Month
- National San Architect Month
- National Service Dog Eye Examination Month
- National Sight-Saving Month
- National Smile Month
- National Strawberry Month
- National Stroke Awareness Month
- National Sweet Vidalia Onion Month
- National Teen Pregnancy Prevention Month
- National Teen Self-Esteem Month
- National Toxic Encephalopathy and Chemical Injury Awareness Month
- National Tuberous Scierosis Awareness Month
- National Vinegar Month
- National Youth Traffic Safety Month
- Necrotizing Fasciitis Awareness Month
- Neurofibromatosis Month
- Older Americans Month
- Personal History Awareness Month
- Posture Month
- Preeclampsia Awareness Month
- Prepare Tomorrow’s Parents Month – May 14 – June 18, 2023 (From Mother’s Day to Father’s Day)
- REACT Month
- Revise Your Work Schedule Month
- Small Business Month
- Spiritual Literacy Month
- Steelmark Month
- Strike Out Strokes Month
- Syringomyelia Awareness Month
- Teen CEO Month
- Tennis Month
- Tourette Syndrome Awareness Month
- Trauma Awareness Month
- Ultraviolet Awareness Month
- Women’s Health Care Month
- Young Achievers / Leaders of Tomorrow Month