At a Glance
September 17
Observances & Celebrations
Commemorative holidays, national days, religious feasts, and international traditions observed on this date.
FeaturedNational observance
Constitution Day and Citizenship Day, observed on the previous Friday if it falls on a Saturday, the following Monday if on a Sunday; and the beginning of the Constitution Week (United States)
United States
National observance
Marathwada Liberation Day (Maharashtra)
Religious observance
Feast of Albert of Vercelli
Religious observance
Feast of Ariadne of Phrygia
Religious observance
Feast of Blessed Cecilia Eusepi
Religious observance
Feast of Hildegard of Bingen
Religious observance
Feast of Lambert
Religious observance
Feast of Robert Bellarmine
Religious observance
Feast of Satyrus of Milan
Religious observance
Feast of September 17 (Eastern Orthodox liturgics)
Religious observance
Feast of Socrates and Stephen
Religious observance
Feast of Stanislaus Papczyński
Religious observance
Feast of Zygmunt Szczęsny Feliński
Observance
Australian Citizenship Day
Australia
Observance
Heroes' Day (Angola)
Observance