Is UK visa valid for Switzerland?

A UK visa is not valid for travel to Switzerland. Switzerland is not part of the United Kingdom. Switzerland is a member of the Schengen Area, which means that the citizens of Schengen countries can travel to any other Schengen country without a visa. The United Kingdom is not a member of the Schengen Area. This means that UK citizens need to apply for a visa to visit Switzerland if they are staying longer than 90 days.