Greece is a member of the Schengen Agreement.
Nationals of EU and EFTA (Iceland, Liechtenstein, Norway, Switzerland) countries only need a valid national identity card or passport for entry - in no case will they need a visa for a stay of any length.
Nationals of non-EU/EFTA countries will generally need a passport for entry to a Schengen country and most will need a visa.
These non-EU/EFTA visa-free visitors may not stay more than 90 days in a 180 day period in the Schengen Area as a whole and, in general, may not work during their stay (although some Schengen countries do allow certain nationalities to work - see below). The counter begins once you enter any country in the Schengen Area and is not reset by leaving a specific Schengen country for another Schengen country, or vice-versa. However, New Zealand citizens may be able to stay for more than 90 days if they only visit particular Schengen countries - see for the New Zealand Government's explanation.
If you are a non-EU/EFTA national (even if you are visa-exempt, unless you are Andorran, Monégasque or San Marinese), make sure that your passport is stamped both when you enter and leave the Schengen Area. Without an entry stamp, you may be treated as an overstayer when you try to leave the Schengen Area; without an exit stamp, you may be denied entry the next time you seek to enter the Schengen Area as you may be deemed to have overstayed on your previous visit. If you cannot obtain a passport stamp, make sure that you retain documents such as boarding passes, transport tickets and ATM slips which may help to convince border inspection staff that you have stayed in the Schengen Area legally.
However, all British Overseas Territories citizens except those solely connected to the Cyprus Sovereign Base Areas are eligible for British citizenship and thereafter unlimited access to the Schengen Area.
Further note that
(*) nationals of Albania, Bosnia and Herzegovina, Macedonia, Montenegro and Serbia need a biometric passport to enjoy visa-free travel,
(**) Serbian nationals with passports issued by the Serbian Coordination Directorate (residents of Kosovo with Serbian passports) do need a visa and
(***) Taiwan nationals need their ID number to be stipulated in their passport to enjoy visa-free travel.
Citizens of Antigua and Barbuda, the Bahamas, Barbados, Mauritius, Saint Kitts and Nevis and Seychelles are permitted to work in Greece without the need to obtain a visa or any further authorisation for the period of their 90 day visa-free stay. However, this ability to work visa-free does not necessarily extend to other Schengen countries.
For detailed regulations applied to your country, refer to Greek Ministry for Foreign Affairs
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