Thread: to (the?) NASA, NATO, UNESCO...

Originally Posted by shadow1

I do not know the rules when to use "the".
But here are more examples, maybe they will help.

I am writing to UNESCO
I am writing to NASA
I am writing to NATO
I am writing to NAFTA
I am writing to MADD

exceptions

I am writing to the US
I am writing to the EU
I am writing to the UN
I am writing to the DMV

I am writing to America (or any country, state, city, person)

The rule has been explained above. You don't use 'the' when you read the acronym as one word.