Greece is quite conservative, and visitors should avoid being ostentatious in their dress or behaviour.
Conservatism includes strong religious ties and beliefs, especially in rural and other traditional areas, and visitors should never comment on religious matters, or identify themselves as atheist, when dealing with traditional people. That said, most business people in Athens and the other major cities are very modern, and this is much less of an issue in such situations.
Discussion of politics is best avoided, especially over sensitive issues such as relations with Turkey, the Cyprus issue, or the politics of the former-Yugoslavia. This is especially true in a business context, as in social situations Greeks may often raise such issues.
Greeks tend to respect the elderly and experienced – young business people may experience small problems in being treated with the same seriousness as older people, and respect should always be given to the elderly and people in senior positions.
More information on doing business in Greece