At a Glance
August 18
Observances & Celebrations
Commemorative holidays, national days, religious feasts, and international traditions observed on this date.
National observance
Constitution Day (Indonesia)
Indonesia
Religious observance
Feast of Agapitus of Palestrina
Religious observance
Feast of Alberto Hurtado
Religious observance
Feast of August 18 (Eastern Orthodox liturgics)
Religious observance
Feast of Daig of Inniskeen
Religious observance
Feast of Evan (or Inan)
Religious observance
Feast of Fiacre
Religious observance
Feast of Florus and Laurus
Religious observance
Feast of Helena of Constantinople (Roman Catholic Church)
Italy
Observance
Arbor Day (Pakistan)
Pakistan
Observance
Armed Forces Day (North Macedonia)
Observance
Birthday of Virginia Dare (Roanoke Island)
Observance
Long Tan Day, also called Vietnam Veterans' Day (Australia)
Australia
Observance
National Science Day (Thailand)
Thailand