Formal:
* Jeg er norsk. (pronounced "yay er norsk") - This is the most common and formal way to say it.
Informal:
* Jeg er fra Norge. (pronounced "yay er fra nor-geh") - This literally means "I am from Norway" but is understood to mean you are Norwegian.
* Jeg er norsk. (pronounced "yay er norsk") - This is also acceptable in informal situations.
When talking about your nationality:
* Min nasjonalitet er norsk. (pronounced "min nas-yo-nah-lee-tet er norsk") - This means "My nationality is Norwegian".
It's important to note that the pronunciation might vary depending on the region of Norway. However, the spelling and grammar will remain the same.