Greek may refer to anything related to Greece, including:

Fraternities and sororities, often called the "Greek System," at colleges and universities.

Greek culture

Greek history

Greeks, a nation and a people

Greek alphabet

Greek language, or, more specifically,

Modern Greek

Koine Greek

Ancient Greek

Medieval Greek

Greeks (finance), a concept in mathematical finance

Greek (TV series), an ABC Family show

Greek to me, an idiom/dead metaphor in English, claiming that an expression is incomprehensible

Greek Theatre (Los Angeles)

Hellenic or Hellenes may refer to: Hellenic Republic, the modern state of Greece Hellenes, a term for either ancient or modern Greeks Hellenic, anything related to Greece in general or Ancient Greece in particular Hellenic College, an Eastern Orthodox...

"Greek style," or simply "Greek," a euphemism for anal sex