1. International Worker’s Day
2. Anniversary of the Dos de Mayo Uprising (Spain)
3. World Press Freedom Day
4. International Firefighters’ Day
5. Cinco de Mayo (Mexico)
6. International No Diet Day
7. National Barrier Awareness Day
8. World Red Cross and Red Crescent Day
9. Europe Day
10. Romania Independence Day
11. (2nd Sat of May) World Migratory Bird Day
12. International Nurses Day
13. World Cocktail Day
14. Israel Independence Day
15. International Day of Families
16. National Caesar Day
17. Norwegian Constitution Day
18. International Museum Day
19. Commemoration of Atatürk, Youth and Sports Day
20. Independence Day and East Timor World Metrology Day
21. World Day for Cultural Diversity for Dialogue and Development
22. International Day for Biological Diversity
23. World Turtle Day
24. Eritrea Independence Day
25. Africa Day (African Union) & Jordan Independence Day
26. Guyana Independence Day & Georgia Independence Day
27. Dragon Quest Day
28. Armenia Independence Day
29. International Day of United Nations Peacekeepers
30. Anguilla Day
31. World No-Tabacco Day