September 17th Holidays: Celebrations and Observances Worldwide

September 17th 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 17th.

Holidays on September 17th

  • RC Saints - Feasts of Saint Lambert (martyr), Hildegard of Bingen
  • United States - Constitution Day (observed on the previous Friday if it falls in a weekend), Citizenship Day, Von Steuben Day
  • Netherlands - Operation Market Garden is still remembered with parachuting and dedications on this day.
  • Also see September 17 (Eastern Orthodox liturgics)
  • The fourth day of the Eleusinian Mysteries in ancient Greek mythology, when the initiates sacrificed a pig.
  • Angola - National Heroes' Day

Observances on September 17th

  • World Patient Safety Day [WHO]