There are many countries that allow dual citizenship, including the United States, Brazil, the United Kingdom, Israel and Ireland, according to Henley & Partners. Additional countries that allow dual citizenship include Russia, France, Switzerland, Columbia and Poland.
Some countries allow dual citizenship only with prior permission or with certain countries, explains Best-Citizenships.com. For instance, Spain allows dual citizenship with some Latin American countries, such as Costa Rica, Dominican Republic, Guatemala, Honduras and Peru. Pakistan only allows dual citizenship with 16 countries, including Australia, Syria, Jordan, the United States and Sweden.
Some countries that do not allow dual citizenship are Austria, Burma, United Arab Emirates, Thailand and Venezuela, notes Best-Citizenships.com. Countries that do allow dual citizenship, but only with prior or special permission, include Egypt, South Africa, Turkey and Germany. Sri Lanka allows dual citizenship with retention.
In the United States, individuals are either citizens by birth or must apply for citizenship through parents or through naturalization, according to U.S. Citizenship and Immigration Services. Dual citizenship or dual nationality for a U.S. citizen does not mean the person risks losing his nationality. In order to lose U.S. nationality, a person must apply for a foreign nationality voluntarily, by free choice, and with the intention to give up U.S. nationality, explains the Bureau of Consular Affairs.