- May 1 - Labour Day (Pakistan)
- May 1 - Labour Day (Singapore)
- May 1 - May Day (Europe)
- May 1 - Labour Day and Ascension Day (Norway)
- May 1 - Labour Day (India)
- May 1 - Labour Day (Guyana)
- May 1 - Labour Day (Brazil)
- May 1 - Labour Day (Chile)
- May 1 - Labour Day (China)
- May 1 - Holocaust Remembrance Day (Israel)
- May 2 - Dos de Mayo (Spain)
- May 5 - Liberation Day (Ethiopia, Netherlands, Denmark)
- May 5 - Children's Day (Japan, South Korea)
- May 5 - Coronation Day (Thailand)
- May 5 - Cinco de Mayo (Mexico)
- May 5 - Indian Arrival Day Guyana
- May 6 - St George's Day (Bulgaria)
- May 7 - Memorial Day (Israel)
- May 8 - Independence Day (Israel)
- May 8 - Victory in Europe Day
- May 8 - Parent's day in South Korea
- May 9 - Europe Day (European Union)
- May 12 - Whit Monday (France, Germany, Austria, Switzerland, Luxembourg, Greece, Hungary, Belgium, The Netherlands, Norway)
- May 14 - Independence Day (Israel)
- May 16 - Jerusalem Day (Israel)
- May 17 - Constitution Day (Norway)
- May 17 - May 3rd Constitution Day (Poland, Lithuania)
- May 18 - Haitian Flag Day (Haiti)
- May 19 - Victoria Day (Canada)
- May 22 - Corpus Christi
- May 23 - Lag Ba'omer (Judaism)
- May 24 - Saints Cyril and Methodius Day (Bulgaria, Republic of Macedonia)
- May 24 - Bermuda Day (Bermuda)
- May 25 - African Liberation Day
- May 25 - Jordan's Independence Day
- May 26 - Spring Bank Holiday (United Kingdom)
- May 26 - Memorial Day (United States)
- May 26 - National Sorry Day (Australia)
- May 26 - Independence Day (Guyana)
- May 27 - Children's Day (Nigeria)
- May 28 - Republic Day (Armenia, Azerbaijan)
- May 29 - Ratu Sir Lala Sukuna Day (Fiji)
- 29: Ascension of Bahá'u'lláh (Bahá'í Faith)
- 29: Democracy Day (Nigeria)
- 30: Indian Arrival Day (Trinidad and Tobago)
- 31: World No Tobacco Day
- Mother's Day
- May 8 (Parent's Day) - South Korea and Albania
- May 10 - Mexico
- May 10 - South America, El Salvador, Guatemala, Oman, and Pakistan
- May 11 (2nd Sunday) - Anguilla, Aruba, Australia, Austria, Bahamas, Barbados, Bangladesh, Belgium, Belize, Bermuda, Bonaire, Brazil, Brunei, Canada, Chile, Colombia, Cuba, Croatia, Curaçao, Czech Republic, Denmark, Ecuador, Estonia, Finland, Germany, Greece, Grenada, Honduras, Hong Kong, Iceland, India, Italy, Jamaica, Japan, Latvia, Malta, Malaysia, The Netherlands, New Zealand, Peru, Philippines, Puerto Rico, Singapore, Slovakia, South Africa, Suriname, Switzerland, Taiwan, Trinidad and Tobago, Turkey, United States, Uruguay, Venezuela, Zimbabwe
- May 25 (last Sunday) - France (switches to first Sunday of June if coincides with Pentecost), Dominican Republic, Haiti, Sweden, and Morocco
- May 26 - Poland
- May 27 - Bolivia
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