September 27 observances and historical events in Lithuania

September 27 marks several international and national observances, including World Tourism Day, World Disability Day, and Social Workers Day in Lithuania.

Historically, this date is significant in Lithuania for several events. In 1422, the Grand Duchy of Lithuania and Poland signed the Peace of Melno with the Teutonic Order. In 1605, Lithuanian forces led by Jonas Karolis Chodkevičius defeated the Swedes at the Battle of Salaspils. Other notable occurrences include the 1927 transformation of the Apostolic Internunciature in Kaunas into a nunciature, and the 2003 decision by the World Heritage Cities Organization to name Vilnius the European Capital of Culture for 2009.

Astrological observations for the day note the Sun in Libra and the third day of the Moon's full phase.