Why does Greece enter the stadium first during the Olympic games?

Because Greece invented and held the first Olympic Games over a couple of centuries;the modern Olympics started in the 1800s and Greece has been given the honour of leading the nations march. Because the first Olympic Games held in 776 BC were held in Greece. These games are commonly called the 'ancient Olympics'. Because of that Greece is honored by being the first country to enter the stadium during opening and closing ceremonies.