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Day Name Established/recognized by
May 1 May Day
May 1 International Workers' Day
1st Saturday in May World Naked Gardening Day
May 3 World Press Freedom Day UN[13][104]
May 4 International Firefighters' Day
May 4 Star Wars Day
May 4 Greenery Day
May 4 Remembrance of the Dead
May 5 International Midwives Day
May 5 Cinco de Mayo
May 6 International No Diet Day
May 7 World Password Day[105]
May 7 National Masturbation Day
May 7 World Wide Day of Genital Autonomy
May 8 World Red Cross and Red Crescent Day
May 8 Teacher's Day
May 8 Victory in Europe Day
May 8–9 Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War UN[13][106]
May 9 Europe Day
May 10 International Migratory Bird Day North America
May 10 Asian American Pacific Islander Mental Health Awareness Day[107]
Friday before Mother's Day Military Spouse Day
May 11 National Technology Day
May 12 International Nurses Day
May 12 International May 12th Awareness Day[108] Centers for Disease Control and others
2nd Sunday in May [a] Mother's Day
May 13 World Cocktail Day
May 15 International Day of Families UN[13][109]
May 16 International Day of Light UNESCO
May 17 Shades Day Family Holiday Association
May 17 Norwegian Constitution Day
May 17 International Day Against Homophobia, Transphobia and Biphobia UN[13]
May 17 World Telecommunication and Information Society Day ITU[110]
May 18 World AIDS Vaccine Day
May 18 International AIDS Candlelight Memorial
May 18 International Museum Day
May 19 World Inflammatory Bowel Disease Day[111]
May 20 World Metrology Day BIPM, OIML[112]
May 20 World Bee Day UN, FAO[113]
May 20 Blue Cone Monochromacy International Awareness Day[114]
May 21 World Day for Cultural Diversity for Dialogue and Development UN[13][115]
May 22 International Day for Biological Diversity UN[13][116]
May 23 World Turtle Day
May 23 Labour Day (Jamaica)
May 24 World Schizophrenia Day 2018
May 24 World Orienteering Day[117]
May 25 Geek Pride Day
May 25 African Liberation Day
May 25 International Missing Children's Day
May 25 World Multiple Sclerosis Day[118]
May 25 Towel Day
May 26 National Paper Airplane Day (USA)
May 28 Menstrual Hygiene Day
May 29 International Day of UN Peacekeepers UN[119]
May 31 World No-Tobacco Day[68] UN, WHO[13][120]
1st Tuesday of May World Asthma Day
1st Sunday in May World Laughter Day
2nd Saturday in May World Fair Trade Day
3rd Thursday in May Global Accessibility Awareness Day
Last Monday in May Memorial Day
Full moon in May Vesak[13]
Second weekend of May World Migratory Bird Day UN, UNEP[13][121]
May (Saturday of third full week) International Heritage Breeds Day[122][123] (USA)
May (First Saturday of the month) Free Comic Book Day[124]