The Metropolitan Archdiocese of Kaunas is a Latin Church ecclesiastical territory or archdiocese of the Catholic Church in Lithuania. The episcopal see is in Kaunas, the second-largest city in Lithuania. The archdiocese's motherchurch and cathedral is Kaunas Cathedral Basilica; it is also home to a Minor Basilica in a town of Šiluva, in the region of Samogitia.

Kaunas is the second-largest city in Lithuania after Vilnius, the fourth largest city in the Baltic States and an important centre of Lithuanian economic, academic, and cultural life. Kaunas was the largest city and the centre of a county in the Duchy of Trakai of the Grand Duchy of Lithuania and Trakai Palatinate since 1413. In the Russian Empire, it was the capital of the Kaunas Governorate from 1843 to 1915.