Ancient Olympics were only open to different greek regions.
Greece
Greece
In the original Greek Olympics only men from the city states that made up Greece were aloud to compete in the Olympics!
Greece
In the ancient Greek Olympics, city-states rather than modern countries competed, with the most notable participants being Athens, Sparta, Corinth, and Thebes. Athletes from various Greek city-states gathered to compete in events, showcasing their strength and skill. The Olympics were primarily a celebration of athletic prowess and religious devotion to Zeus, attracting competitors from across the Hellenic world. Participation was limited to freeborn Greek men, while women were generally excluded from competing.
Citizens from all the over 2,000 Greek city-states were eligible..
Individuals who were citizens of any of the over 2,000 Greek city-states were eligible.
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The first Olympics were held in Greece but only slaves from different regions of Africa and the middle east competed as a source of entertainment for the Greek high class.
It is unsure of exactly all the city states who participated, but here are a few:Rhodes, Croton, Sparta, Elis, Krannon (also known as Thessaly), Smyrna, Sybaris,Syrecuse, Heraia (also known as Arkadia), and Thebes.
if you are talking about the first ancient Olympics then the answer is yes, if you are taling about the first modern Olympics then the answer is no, athletes from 14 nations competed, including, USA, Great Britain, France, Germany and Australia