Most Lithuanians belong to the Roman Catholic Church, while the Lietuvininkai who lived in the northern part of East Prussia prior to World War II, were mostly Evangelical Lutherans.
De fleste litauere tilhører den romersk-katolske kirke, mens Lietuvininkai, der boede i den nordlige del af Østpreussen forud for 2. verdenskrig, fortrinsvis var evangelisk-lutherske.