September 15th Holidays: Celebrations and Observances Worldwide

September 15th is a day filled with various holidays, celebrations, observances, and historical significance around the world. From international events to national holidays and religious commemorations and saints, this date holds special meaning for many cultures and communities. Explore the list of holidays, observances and saints celebrated on September 15th.

Holidays on September 15th

  • Bulgaria - The first day of school.
  • Japan - Respect for the Aged Day before 2003; beginning in 2003, Respect for the Aged Day is held on the third Monday of September.
  • The United Kingdom - the British commemorate the Battle of Britain on the day of the last massive Luftwaffe attack in 1940.
  • Also see September 15 (Eastern Orthodox liturgics).
  • RC Saints - Feast day of Our Lady of Sorrows.
  • Independence Day from Spain (1821) for Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua, celebrated everywhere with marches from schoolchildren.
  • In ancient Greece, the second day of the Eleusinian Mysteries, when the priests of Demeter declared the public start of the rites.
  • In Slovakia - Holyday of the Seven sorrows of Virgin Maria

Observances on September 15th

  • International Day of Democracy