How is Olympic opening ceremony order of countries determined?

Greece, as always, will be the first country introduced in the Parade of Nations for the 2026 Milano Cortina Winter Olympics.

Here's the order for the Parade of Nations at the 2026 Olympics Opening Ceremony

Here is the order in which countries will march out for the Parade of Nations at the Opening Ceremony for the 2026 Milan Cortina Games.
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Why was the US put at the end of the Olympic opening ceremony parade (again)?

It has nothing to do with alphabetical order.

How many nations will be at the Winter Olympics? Here's a list of every country

There are 206 National Olympic Committees worldwide, which are devised by the IOC and the International Sport Federation. These two organizations are the sole authorities who come together to recognize NOCs for the official Summer and Winter Games.