What European countries are not in NATO?

Finland, Austria, Ireland, Yugoslavia, Switzerland, Liechtenstein, Malta, and Sweden are the traditionally neutral countries.

During the Cold War, there were also the Warsaw Pact countries, of course, which consisted of the Soviet Union, Bulgaria, Romania, East Germany, Poland, Hungary, and Czechoslovakia. Albania was originally a member, but withdrew in 1968, and declared themselves a neutral country. Currently, Albania is a member of NATO.