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- May 1 – International Workers’ Day (International Labour Day)
- 1st Sunday In May – World Laughter Day
- May 1 – May Day
- May 3 – World Press Freedom Day
- May 4 – Greenery Day
- May 4 – Coal Miners’ Day
- May 4 – International Firefighters Day
- May 4 – Star Wars Day
- May 5 – International Midwives’ Day
- May 6 – International No Diet Day
- May 7 – World Athletics Day
- May 8 – Teacher’s Day
- May 8 – World Red Cross Day
- May 9 – National Law Enforcement Day
- May 9 – World Pizza Day
- May 11 – National Technology Day
- May 12 – International Nurses Day
- 2nd Sunday In May – Mother’s Day
- May 15 – International Day of Families
- May 17 – World Information Society Day
- May 17 – World Hypertension Day
- May 18 – Plant Conservation Day
- May 18 – World AIDS Vaccine Day
- May 18 – International Museum Day
- May 22 – International Day for Biological Diversity
- May 23 – Labour Day (Jamaica)
- May 23 -World Turtle Day
- May 24 – World Brother Day
- May 24 – Commonwealth Day
- May 25 – World Thyroid Day
- May 25 – International Missing Children’s Day
- May 28 -Menstrual Hygiene Day
- May 31 – World No Tobacco Day
