:Union of Vilnius/Wilno redirects here. For the 1499 treaty, see Union of Kraków and Vilna.
The Wilno Pact was an agreement reached on November 28, 1561 between Sigismund II Augustus and the Livonian Brothers of the Sword. The order was secularized, Courland and Semigalia became the Duchy of Courland and were granted to Gotthard Kettler. Grand Duchy of Lithuania gained Riga and the rest of Livonia, though these lands regained some autonomy.

The Pact resulted in the Northern Seven Years' War.

Category:1561 in LithuaniaCategory:History of EstoniaCategory:History of LatviaWilnoCategory:History of Poland (1385–1569)Category:History of VilniusCategory:16th-century treatiesCategory:Articles lacking sources (Erik9bot)
de:Union von Wilnafr:Pacte de Wilnolv:Viļņas ūnijapl:Pakt wileńskipt:União de Wilnoru:Виленская унияuk:Віленська унія