A passport is required for travel to Croatia. A visa is not required for U.S. passport holders for tourist or business trips of fewer than 90 days within a six-month period. All foreign citizens must register with the local police within 24 hours of arrival and inform the office about any change in their address. Registration of foreign visitors staying in hotels or accommodations rented through an accommodation company is done automatically by the hotelier or accommodation company. Failure to register is a misdemeanor offense; some Americans have been fined as a result of their failure to register.
U.S. citizens already in Croatia who wish to remain in Croatia for more than 90 days must obtain a temporary residence permit from the local police having jurisdiction over their place of residence in Croatia. With their residency application, applicants will need to provide a copy of their birth and marriage certificates (obtained within 90 days before application) and a police report authenticated for use abroad from their state of residence in the U.S. or from the country where they permanently reside. All documents should have an “apostille” stamp certifying their authenticity. Information regarding apostilles and authentication of documents is available at http://travel.state.gov/law/info/judicial/judicial_701.html.