Greece has entered first since the beginning of the Olympics.
Greece where the olympics started
The host nation always marches out last at the Olympics opening ceremony.
Olympic protocol states the first athletes that enter the stadium during the opening ceremony are those from Greece in recognition of Greece being the home of the Olympics (where the Ancient Olympics first began).
The opening ceremony happens at the Olympic stadium of the country hosting the games
All teams go in the opening ceremony. Greece goes first, he host country goes last, and the rest is in alphebetical order by the host country's national language.
Greece is always the first country in the Olympic Opening Ceremony, because the Olympics originated from Greece.
To represent every single country