Greece, like most countries in Europe, has a civil law legal system. Countries with civil law systems have extensive, frequently updated codes that make up their primary law. Civil law jurisdictions rely primarily on legislation, whereas common law jurisdictions (like the United States) rely primarily on court decisions to interpret legislation. Primary sources of law in a civil law system include constitutions, codes and statutes, and regulations. Court decisions and commentary are considered secondary sources.
Most Greek laws and cases will be in Greek. English translations are rare, but sometimes available in journal articles or commercial publications. You will likely need to rely heavily on summaries of laws and cases in secondary sources.
All legislation appears in the official national gazette: Efimerida tis Kyberniseos (in Greek). Some English translations may be available through commercial publications, but you will likely need to primarily rely on summaries in secondary sources or abstracts in subject law collections.
Sources beyond journal articles where you can find summaries of laws and cases include the International Encyclopaedia of Laws, Getting the Deal Through, and Practical Law Cross-Border resources.
Cases are available in Greek on court websites. The decisions of most courts are not published officially, so you can search for jurisprudence in unofficial sources such as legal journals.
Subject law collections provide access cases and legislation from Greece and other countries pertaining to a specific subject area. Using a subject law collection is particularly helpful when you are comparing the laws of more than one country.
For more suggestions on subject-specific collections of laws, please see GlobaLex's Foreign Law - Subject Law Collections on the Web research guide.