- National Motorcycle Safety Month – MAY
- Bicycle Safety Month – MAY
- National Arthritis Month – MAY
- Better Hearing and Speech Month – MAY
- Loyalty Day – MAY 1
- ALS Awareness Month – MAY
- National Electric Safety Month – MAY
- Substitute Teacher Appreciation Week – 1st Week in MAY
- School Principal’s Day – MAY 1
- National Women’s Health Week – 1st Week in MAY
- National Cancer Research Month – MAY
- Asian Pacific American Heritage Month – MAY
- Child Nutrition Employee Appreciation Week – 1st Week in MAY
- National Teen Self-Esteem Month – MAY
- National Pet Week – 1st Week in MAY
- Be Kind to Animals Week – 1st Week in MAY
- Brain Tumor Action Week – 1st Week in MAY
- Haitian Heritage Month – MAY
- Heal the Children Month – MAY
- Healthy Vision Month – MAY
- Huntington’s Disease Awareness Month – MAY
- Meditation Month – MAY
- National Mental Health Month – MAY
- Melanoma & Skin Cancer Prevention Month – MAY
- National Bike Month – MAY
- National Charter Schools Week – 1st Week in MAY
- Children’s Book Week – 1st Week in MAY
- National Foster Care Month – MAY
- National Hepatitis Awareness Month – MAY
- National Neurofibromatosis Awareness Month – MAY
- Get Caught Reading Month – MAY
- Family Wellness Month – MAY
- National Stuttering Awareness Week – 2nd Week in MAY
- National Stroke Awareness Month – MAY
- National Tourism Week – 1st Week in MAY
- Fibromyalgia Education and Awareness Month – MAY
- National Lupus Awareness Month – MAY
- International Multiple Sclerosis Month – MAY
- North American Occupational Safety and Health Week – 1st Week in MAY
- Goodwill Industries Week – 1st Week in MAY
- Public Service Recognition Week – 1st Week in MAY
- National Safe Kids Week – 1st Week in MAY
- Teachers Appreciation Week – 1st Week in MAY
- High Blood Pressure Education Month – MAY
- Clean Air Month – MAY
- Reading Is Fun Week – 2nd Week in MAY
- Teachers Appreciaton Day – MAY 3
- Older Americans Month – MAY
- National Physical Fitness and Sports Month – MAY
- National Osteoporosis Prevention Month – MAY
- Cinco de MAYo – MAY 5
- Join Hands Day – 1st Saturday in MAY
- National Nurses Week – MAY 6 – MAY 12
- Nurses Day – MAY 6
- Child Care Provider Day – MAY 7
- National Hospital And Healthcare Week – 2nd Week in MAY
- National Employee Health & Fitness Day – 3rd Wednesday in MAY
- Food Allergy Awareness Week – 2nd Week in MAY
- Memorial Day – Last Monday in MAY
- National School Nurse Day – MAY 8
- National Oral, Head, and Neck Cancer Awareness Week – MAY 8 – MAY 14
- Salvation Army Week – MAY 8 – MAY 15
- World Red Cross Day – MAY 8
- National Student Nurses Day – MAY 8
- International Nurses Day – MAY 12
- National Police Week – MAY 13 – MAY 19, 2012
- National Running and Fitness Week – 2nd Week in MAY
- National Nursing Home Week – 2nd Week in MAY
- National Transportation Week – 1st Week in MAY
- Mother’s Day – 2nd Sunday in MAY
- National EMS Week – 3rd Week in MAY
- National Safe Boating Week – MAY 21 – MAY 27
- National Emergency Medical Services Week – 3rd Week in MAY
- Click It or Ticket Mobilization Week – Last Week in MAY
- National Senior Health and Fitness Day – MAY 26
- World No Tobacco Day – MAY 31