Beltaine : Pagan and Wiccan.

 May Day (Labor Day) : International.

 Satyajit Ray (1921–1992) : Indian.

 James Brown (1933–2006) : African American.

 Paul G. Hearne (1950?–1998) : People with Disabilities.

 Constitution Day : Poland.

 Keith Haring (1959–1990) : Gay.

 Jane Jacobs (1916–2006) : Jewish Canadian.

 Henryk Sienkiewicz (1846–1916) : Polish.

 Youth Day : People's Republic of China.

 Greenery Day (Midori No Hi) : Japan.

 Restoration of Independence : Latvia.

 Del Martin (born Dorothy L. Taliaferro) (1921–2008) : Lesbian.

 Liberation Day : Netherlands.

 Children's Day (Kodomo No Hi) : Japan.

 Children's Day (Tano) : South Korea.

 Cinco de Mayo : Mexico.

 Coronation Day : Thailand.

 Amadeo Giannini (1870–1949) : Italian American.

 Rabindranath Tagore (1861–1941) : Indian.

 Constitution Day (Kempo Kinen Bi) observed : Japan.

 National Day of Prayer : United States. (m)

 Miguel Hidalgo y Costilla (1753–1811) : Mexican.

 Victory Day, WWII : France.

 Visakaha (vye-sak-hah) Day : Buddhist. (m)

 Mother's Day : Finland, United States. (m)

 Mother's Day : Mexico.

 William Grant Still (1895–1978) : African American.

 Lag B'Omer begins at sundown : Jewish. (m)

 Victory Day observed : Russia, Ukraine.

 Oscar De Priest (1871–1951) : African American.

 Lag B'Omer : Jewish. (m)

 Our Lady of Fatima Day : Portugal.

 Brown vs. Board of Education of Topeka (1954) : African American.

 Santo Christo Day : Portugal. (m)

 National Day : Norway.

 Frank Capra (1897–1991) : Italian American.

 Pope John Paul II (born Karol Józef Wojtyla) (1920–2005) : Polish.

 Victoria Day observed : Canada. (m)

 Lorraine Hansberry (1930–1965) : African American.

 Malcolm X (1925–1965) : African American.

 Atatürk and Youth Day : Turkey.

 Independence Day : Cuba.

 Lázaro Cárdenas (1895–1970) : Mexican.

 Ascension Day : Christian. (m)

 Battle of Iquique : Chile.

 Harvey Milk (1930–1978) : Gay.

 Declaration of the Bab : Baha'i.

 National Day (Amendment of the Constitution) : Morocco.

 James Francis "Jim" Thorpe (1888–1953) : American Indian (Sauk and Fox).

 Battle of Pichincha : Ecuador.

 Africa Day : Zambia, Zimbabwe.

 Independence Day : Jordan.

 Anniversary of the May Revolution : Argentina.

 Memorial Day observed : United States. (m)

 Susette LaFlesche Tibbles (1854–1903) : American Indian (Omaha).

 Independence Day : Republic of Georgia.

Ascension Day : Coptic Orthodox Christian, Eastern Orthodox Christian. (m)

 Shavuoth begins at sundown : Jewish. (m)

 Dragon Boat Festival (Tuan-wu) : China. (m)

 Republic Day : Azerbaijan.

 Restoration of Statehood Day : Armenia.

 Chien-Shiung Wu (1912–1997) : Chinese American.

 Ascension of Baha'u'llah : Baha'i.

 Shavuot (Festival of Weeks) : Jewish. (m)

 Harvest Festival : Malaysia.

 Mother's Day : Nicaragua.

 Pentecost (Whit Sunday) : Christian. (m)