There are 3 countries that have decided not to release the movie under it’s full name, “Captain America: The First Avenger”. They have opted to release it under the name “The First Avenger”. Those 3 countries are Russia, Ukraine and South Korea.
Marvel & Paramount gave countries a choice of title between “Captain America: The First Avenger” & just “The First Avenger”. Those three countries are the only 3 to release it simply under “The First Avenger” banner. The countries have refused to give a reason why they aren’t using the original title. But, an inside source at the New York Times claimed the marketers changed the name for “cultural and political reasons“.