Greek may refer to:
Anything of, from, or related to Greece, a country in Southern Europe:
- Greeks, an ethnic group
- Greek language, a branch of the Indo-European language family
- Proto-Greek language, the assumed last common ancestor of all known varieties of Greek
- Mycenaean Greek, most ancient attested form of the language (16th to 11th centuries BC)
- Ancient Greek, forms of the language used c. 1000–330 BC
- Koine Greek, common form of Greek spoken and written during Classical antiquity
- Medieval Greek or Byzantine Language, language used between the Middle Ages and the Ottoman conquest of Constantinople
- Modern Greek, varieties spoken in the modern era (from 1453 AD)
- Greek alphabet, script used to write the Greek language
- Greek Orthodox Church, several Churches of the Eastern Orthodox Church
- Ancient Greece, the ancient civilization before the end of Antiquity
- Old Greek, the language as spoken from Late Antiquity to around 1500 AD
- Greek mythology, a body of myths originally told by the Ancient Greeks