Yes. Switzerland became a full member of the United Nations on September 10, 2002—the first country to join via a national referendum (54.6% voted yes).
Switzerland's traditional neutrality made UN membership controversial. Critics feared it would compromise neutrality; supporters argued engagement strengthens it. The 1986 referendum rejected membership (3:1); the 2002 vote reflected post-Cold War pragmatism.
Switzerland interprets UN membership as compatible with neutrality: it doesn't join military alliances or sanctions regimes unilaterally, but participates in collective security and humanitarian actions.
Today, Switzerland is one of the UN's most active, best-funded, and credible members—proving neutrality and multilateralism can coexist.