Is there a country in the world that has never been occupied by a foreign country?

As far as I know, this country really doesn't exist. Needless to say, countries in Africa, America and Oceania were all occupied and then independent (before World War II, there were only three nominally independent countries in Africa, Egypt was invaded repeatedly, Ethiopia was occupied by Italy before World War II, and Liberia was a country founded by African-American immigrants, which was invaded by Britain and France and lost a lot of territory. Before the existence of Liberia, there were Dutch and Ethiopian countries here. At the beginning of the 19th century, there were only a few independent countries in Asia, such as China, Japan, Thailand, Persia, etc. All of them were semi-colonial except Japan, which was occupied by the United States after World War II, so Asian countries did not have to consider it. Among the existing countries in Europe, the countries in Southeast Europe were occupied by Austria-Hungary and Ottoman Empire before World War I, while those in Eastern Europe were occupied by Russia), Spain and Portugal were occupied by Arabs until the 15th century, and Denmark and Norway in Western Europe and Northern Europe were occupied by Germany in World War II. Finland in northern Europe was occupied by Russia, Iceland was occupied by Denmark, Sweden was occupied by Denmark, and it was once a part of the Macard League. Switzerland was once a part of the Holy Roman Empire, and it was also invaded by Germans.

So a country that has never been occupied by a foreign nation does not exist. If you really want to find one, the European pocket countries, Vatican and San Marino, can be regarded as barely. You can check their history.